|
Acquisitions And Other Investments (Spider Purchase Price Allocation) (Details) (USD $)
In Millions, unless otherwise specified |
Dec. 31, 2011
|
Dec. 31, 2010
|
Dec. 31, 2010
Spider [Member]
Scenario, Previously Reported [Member]
|
Dec. 31, 2010
Spider [Member]
Scenario, Adjustment [Member]
|
Jul. 06, 2010
Spider [Member]
Scenario, Adjustment [Member]
|
Dec. 31, 2010
Spider [Member]
Scenario, Change [Member]
|
|---|---|---|---|---|---|---|
| Business Acquisition [Line Items] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Cash | Ìý | Ìý | $ 56.9 | $ 56.9 | $ 56.9 | Ìý |
| Fair value of total consideration transferred | Ìý | Ìý | 56.9 | 56.9 | Ìý | Ìý |
| Fair value of Cliffs' ownership interest in subsidiary held prior to acquisition of remaining interest | Ìý | Ìý | 4.9 | 4.9 | Ìý | Ìý |
| Total net assets acquired | Ìý | 1.7 | 61.8 | 61.8 | Ìý | Ìý |
| Cash | Ìý | Ìý | 9.0 | 9.0 | Ìý | Ìý |
| Other current assets | Ìý | Ìý | 4.5 | 4.5 | Ìý | Ìý |
| Mineral rights | Ìý | Ìý | 31.0 | 35.3 | Ìý | 4.3 |
| Total identifiable assets acquired | Ìý | Ìý | 44.5 | 48.8 | Ìý | 4.3 |
| Other current liabilities | Ìý | Ìý | (5.2) | (5.2) | Ìý | Ìý |
| Long-term deferred tax liabilities | (1,041.8) | Ìý | (2.7) | (5.1) | Ìý | (2.4) |
| Total identifiable liabilities assumed | Ìý | Ìý | (7.9) | (10.3) | Ìý | (2.4) |
| Total identifiable net assets acquired | Ìý | Ìý | 36.6 | 38.5 | Ìý | 1.9 |
| Goodwill | Ìý | Ìý | 77.1 | 75.2 | Ìý | (1.9) |
| Noncontrolling interest in subsidiary | (1,075.4) | Ìý | (51.9) | (51.9) | Ìý | Ìý |
| Total net assets acquired | Ìý | $ 1.7 | $ 61.8 | $ 61.8 | Ìý | Ìý |
| X | ||||||||||
|
- Definition
Amount of cash paid to acquire the entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The amount of acquisition cost of a business combination allocated to assets acquired. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The total purchase price of the acquired entity. This includes cash paid to equity interest holders of the acquired entity, fair value of debt and equity securities issued to equity holders of the acquired entity, and transaction costs paid to third parties to consummate the acquisition. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of cash and cash equivalents acquired in a business combination. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of acquisition cost of a business combination allocated to prepaid expenses and other current assets. Does not include amounts allocated to cash and cash equivalents, marketable securities, receivables, inventory, and assets not to be used. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of acquisition cost of a business combination allocated to other current liabilities of the acquired entity. Does not include amounts allocated to the current portion of long-term debt, accounts payable and accrued expenses. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of deferred tax assets or liabilities for the differences between the values assigned and the tax bases of assets and liabilities in a business combination, net of any valuation allowance for deferred tax assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of acquisition cost of a business combination allocated to liabilities assumed. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of acquisition cost of a business combination allocated to mineral rights for acquired entities in the mining industry. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This element represents the fair value of the noncontrolling interest in the acquiree at the acquisition date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This element represents the sum of the: (1) acquisition-date fair value of the total consideration transferred which consists of the sum of the acquisition-date fair values of the assets transferred by the acquirer, the liabilities incurred by the acquirer to former owners of the acquiree, and the equity interests issued by the acquirer and (2) the acquisition-date fair value of any equity interest in the acquiree held by the acquirer prior to the business combination (for example, a step acquisition). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
In a business combination achieved in stages, this element represents the acquisition-date fair value of the equity interest in the acquiree held by the acquirer immediately before the acquisition date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|