Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011	Mar. 31, 2012 Non-US tax positions open to examination	Dec. 31, 2010 Court decisions approved between Bankruptcy Court and entity	Mar. 31, 2012 Examination issues and settlements with U.S. federal, state, and foreign tax authorities
Income Taxes
Estimated income tax rate for forecasted income (as a percent)	33.30%	32.50%
Material change to aggregate recorded liabilities for uncertain tax positions in the next twelve months
Material changes to uncertain tax positions, lower range				$ 41.4
Material changes to uncertain tax positions, upper range				73.0
Expected recognition of a deferred charge	20.8		21.3	7.3
Decrease in unrecognized tax benefits during the next 12 months						6.6
Income tax settlement for prior period					15.0
Accrued interest and penalties related to uncertain tax positions	9.4		8.8
Accrued interest and penalties related to uncertain tax positions, Net of applicable tax benefits	$ 7.2		$ 6.9