Taxation (Summary of (Provision) Benefit for Income Taxes) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Federal	$ (227.5)us-gaap_CurrentFederalTaxExpenseBenefit	$ (149.3)us-gaap_CurrentFederalTaxExpenseBenefit	$ (103.5)us-gaap_CurrentFederalTaxExpenseBenefit
State	(31.3)	(22.0)	(15.6)
Foreign	(161.2)us-gaap_CurrentForeignTaxExpenseBenefit	(129.9)us-gaap_CurrentForeignTaxExpenseBenefit	(114.6)us-gaap_CurrentForeignTaxExpenseBenefit
Current income tax (provision)	(420.0)us-gaap_CurrentIncomeTaxExpenseBenefit	(301.2)us-gaap_CurrentIncomeTaxExpenseBenefit	(233.7)us-gaap_CurrentIncomeTaxExpenseBenefit
Federal	26.8	(24.1)	(30.2)
State	1.0	(7.4)	9.4
Foreign	1.6	(4.2)	(6.9)
Deferred income tax (provision)	29.4us-gaap_DeferredIncomeTaxExpenseBenefit	(35.7)us-gaap_DeferredIncomeTaxExpenseBenefit	(27.7)us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax (provision)	$ (390.6)us-gaap_IncomeTaxExpenseBenefit	$ (336.9)us-gaap_IncomeTaxExpenseBenefit	$ (261.4)us-gaap_IncomeTaxExpenseBenefit

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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