Quarterly report pursuant to Section 13 or 15(d)

Fair Value Of Financial Instruments (Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation) (Details)

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3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Fair Value Of Financial Instruments [Abstract]    
Beginning balance - January 1 $ 157.9 $ 45.6
Total gains    
Included in earnings 43.3 44.6
Settlements (132.0) (22.1)
Ending balance - March 31 69.2 68.1
Total gains for the period included in earnings attributable to the change in unrealized gains on assets still held at the reporting date $ 43.3 $ 44.6