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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]        
Balance $ (1.1)    $ (19.5)   
Total losses        
Included in earnings (14.7)    (15.8)   
Included in other comprehensive income          
Settlements      19.5   
Transfers into Level 3            
Transfers out of Level 3          
Balance (15.8)    (15.8)   
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)    $ (15.8)