Income Taxes (Schedule of Components of Provision for Income Taxes) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Current tax expense (benefit)	$ 261.8	$ 145.5	$ 118.4
Deferred tax expense (benefit)	(74.6)	82.6	(36.9)
Benefit (provision) for income taxes	187.2	228.1	81.5
United States [Member]
Current tax expense (benefit)	59.2	31.0	(22.7)
Deferred tax expense (benefit)	(120.0)	84.9	10.8
Benefit (provision) for income taxes	(60.8)	115.9	(11.9)
Non-U.S. [Member]
Current tax expense (benefit)	202.6	114.5	141.1
Deferred tax expense (benefit)	45.4	(2.3)	(47.7)
Benefit (provision) for income taxes	$ 248.0	$ 112.2	$ 93.4