Components of Consolidated Provision for Income Taxes (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current Tax Provision:
Federal	$ 291.5us-gaap_CurrentFederalTaxExpenseBenefit	$ 185.6us-gaap_CurrentFederalTaxExpenseBenefit	$ 140.5us-gaap_CurrentFederalTaxExpenseBenefit
State	47.2	24.6	21.4
Non-U.S.	76.1us-gaap_CurrentForeignTaxExpenseBenefit	67.4us-gaap_CurrentForeignTaxExpenseBenefit	63.4us-gaap_CurrentForeignTaxExpenseBenefit
Total	414.8us-gaap_CurrentIncomeTaxExpenseBenefit	277.6us-gaap_CurrentIncomeTaxExpenseBenefit	225.3us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred Tax Provision:
Federal	(31.1)	53.9	66.0
State	(1.6)	14.1	10.6
Non-U.S.	(3.7)	(1.4)	3.1
Total	(36.4)us-gaap_DeferredIncomeTaxExpenseBenefit	66.6us-gaap_DeferredIncomeTaxExpenseBenefit	79.7us-gaap_DeferredIncomeTaxExpenseBenefit
Provision for Income Taxes	$ 378.4us-gaap_IncomeTaxExpenseBenefit	$ 344.2us-gaap_IncomeTaxExpenseBenefit	$ 305.0us-gaap_IncomeTaxExpenseBenefit

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