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Quarterly report pursuant to Section 13 or 15(d)

Fair Value Of Financial Instruments (Fair Value, Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation) (Detail)

v2.4.0.6
Fair Value Of Financial Instruments (Fair Value, Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation) (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] Ìý Ìý Ìý Ìý
Balance $ (1.1) ÌýÌý $ (19.5) ÌýÌý
Total losses Ìý Ìý Ìý Ìý
Included in earnings (14.7) ÌýÌý (15.8) ÌýÌý
Included in other comprehensive income Ìý ÌýÌý Ìý ÌýÌý
Settlements Ìý ÌýÌý 19.5 ÌýÌý
Transfers into Level 3 ÌýÌý ÌýÌý ÌýÌý ÌýÌý
Transfers out of Level 3 Ìý ÌýÌý Ìý ÌýÌý
Balance (15.8) ÌýÌý (15.8) ÌýÌý
Total losses for the period included in earnings attributable to the change in unrealized losses on assets still held at the reporting date $ (14.7) ÌýÌý $ (15.8) ÌýÌý