Income Tax Provision (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Line Items]
Federal	$ 130.1us-gaap_CurrentFederalTaxExpenseBenefit	$ 468.5us-gaap_CurrentFederalTaxExpenseBenefit	$ 115.0us-gaap_CurrentFederalTaxExpenseBenefit
Foreign	32.3us-gaap_CurrentForeignTaxExpenseBenefit	37.2us-gaap_CurrentForeignTaxExpenseBenefit	40.0us-gaap_CurrentForeignTaxExpenseBenefit
State	15.8	57.6	15.6
Current provision, total	178.2us-gaap_CurrentIncomeTaxExpenseBenefit	563.3us-gaap_CurrentIncomeTaxExpenseBenefit	170.6us-gaap_CurrentIncomeTaxExpenseBenefit
Federal	(17.8)	(29.9)	34.2
Foreign	(3.9)	(3.8)	(4.2)
State	(5.2)	(6.0)	1.7
Deferred (benefit) provision, total	(26.9)us-gaap_DeferredIncomeTaxExpenseBenefit	(39.7)us-gaap_DeferredIncomeTaxExpenseBenefit	31.7us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax provision	$ 151.3us-gaap_IncomeTaxExpenseBenefit	$ 523.6us-gaap_IncomeTaxExpenseBenefit	$ 202.3us-gaap_IncomeTaxExpenseBenefit

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