Income Taxes Components of Income Tax Expense (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income before income taxes:
United States	$ 385.6	$ 360.8	$ 330.2
International	99.9	113.0	111.6
Income before income taxes	485.5	473.8	441.8
Provision for income taxes — current:
Federal	90.1us-gaap_CurrentFederalTaxExpenseBenefit	94.6us-gaap_CurrentFederalTaxExpenseBenefit	66.4us-gaap_CurrentFederalTaxExpenseBenefit
State	15.4	15.1	12.8
International	22.5us-gaap_CurrentForeignTaxExpenseBenefit	21.0us-gaap_CurrentForeignTaxExpenseBenefit	33.0us-gaap_CurrentForeignTaxExpenseBenefit
Total provision-current	128.0us-gaap_CurrentIncomeTaxExpenseBenefit	130.7us-gaap_CurrentIncomeTaxExpenseBenefit	112.2us-gaap_CurrentIncomeTaxExpenseBenefit
Provision for income taxes — deferred:
Federal	24.4	14.4	25.6
State	2.7	0.1	1.8
International	3.2	(1.2)	0.1
Total provision — deferred	30.3us-gaap_DeferredIncomeTaxExpenseBenefit	13.3us-gaap_DeferredIncomeTaxExpenseBenefit	27.5us-gaap_DeferredIncomeTaxExpenseBenefit
TOTAL PROVISION FOR INCOME TAXES	$ 158.3us-gaap_IncomeTaxExpenseBenefit	$ 144.0us-gaap_IncomeTaxExpenseBenefit	$ 139.7us-gaap_IncomeTaxExpenseBenefit

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