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Quarterly report pursuant to Section 13 or 15(d)

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

v2.3.0.15
Fair Value Of Financial Instruments (Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation) (Details) (USD $)
In Millions
3 Months Ended 9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Fair Value Of Financial Instruments [Abstract] Ìý Ìý Ìý Ìý
Beginning balance $ 64.0 $ 238.9 $ 45.6 $ 63.2
Included in earnings 53.8 25.1 144.9 824.9
Settlements (50.0) (56.4) (102.7) (680.5)
Transfers out of Level 3 Ìý 161.8 20.0 161.8
Ending balance - September 30 67.8 45.8 67.8 45.8
Total gains for the period included in earnings attributable to the change in unrealized gains on assets still held at the reporting date $ 53.8 $ 25.1 $ 144.9 $ 93.4