Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Unrecognized tax benefits	$ 159.3
Unrecognized tax benefits that would impact effective tax rate	61.7
Effective income tax rate	32.80%	25.50%
Tax benefit related to charges incurred in connection with repositioning actions		(39.5)
Tax provision related to remeasurement gain		2.8
Tax accrual for agreed upon adjustments to income tax returns under examination		$ 9.0
Effective income tax rate, excluding repositioning actions, remeasurement gain and tax accrual for agreed upon adjustments to income tax returns under examination		34.10%