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Annual report pursuant to Section 13 and 15(d)

Goodwill And Other Intangible Assets And Liabilities (Narrative) (Details)

v2.4.0.6
Goodwill And Other Intangible Assets And Liabilities (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended 3 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
North American Coal [Member]
Dec. 31, 2010
North American Coal [Member]
Dec. 31, 2009
North American Coal [Member]
Dec. 31, 2010
Other [Member]
Dec. 31, 2011
Other [Member]
Dec. 31, 2011
Lower Limit [Member]
Dec. 31, 2011
Upper Limit [Member]
Dec. 31, 2011
Below-Market Sales Contracts [Member]
Dec. 31, 2010
Below-Market Sales Contracts [Member]
Dec. 31, 2009
Below-Market Sales Contracts [Member]
Dec. 31, 2011
Consolidated Thompson [Member]
Dec. 31, 2011
CLCC [Member]
Arising in business combinations $ 983.4 $ 111.9 Ìý $ (0.1) $ 27.9 Ìý $ 80.9 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Goodwill 1,152.1 196.5 74.6 Ìý 27.9 ÌýÌý 80.9 80.9 Ìý Ìý Ìý Ìý Ìý 983.5 Ìý
Goodwill, Impairment Loss 27.8 Ìý Ìý 27.8 ÌýÌý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 27.8
Amortization expense relating to intangible assets 17.7 18.8 8.2 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Below-market sales contracts life (in years) Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 3.5 8.5 Ìý Ìý Ìý Ìý Ìý
Product $ 6,551.7 $ 4,416.8 $ 2,216.2 Ìý Ìý Ìý Ìý Ìý Ìý Ìý $ 57.0 $ 62.4 $ 30.3 Ìý Ìý