Components of Provision for Income Taxes (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current provision:
Federal	$ 482.4us-gaap_CurrentFederalTaxExpenseBenefit	$ 191.4us-gaap_CurrentFederalTaxExpenseBenefit	$ 126.2us-gaap_CurrentFederalTaxExpenseBenefit
State	59.0	20.9	31.5
Foreign	215.4us-gaap_CurrentForeignTaxExpenseBenefit	214.1us-gaap_CurrentForeignTaxExpenseBenefit	207.9us-gaap_CurrentForeignTaxExpenseBenefit
Current Income Tax Expense (Benefit), Total	756.8us-gaap_CurrentIncomeTaxExpenseBenefit	426.4us-gaap_CurrentIncomeTaxExpenseBenefit	365.6us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred (benefit) provision:
Federal	(88.3)	68.8	134.4
State	0.3	18.4	9.5
Foreign	(10.0)	10.1	7.8
Deferred taxes	(98.0)us-gaap_DeferredIncomeTaxExpenseBenefit	97.3us-gaap_DeferredIncomeTaxExpenseBenefit	151.7us-gaap_DeferredIncomeTaxExpenseBenefit
Income taxes	$ 658.8us-gaap_IncomeTaxExpenseBenefit	$ 523.7us-gaap_IncomeTaxExpenseBenefit	$ 517.3us-gaap_IncomeTaxExpenseBenefit

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

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