Income Taxes (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes
Unremitted earnings of foreign subsidiaries	$ 216.2
Reconciliation of the beginning and ending balances of the total amounts of unrecognized tax benefits
Balance at the beginning of the period	19.4us-gaap_UnrecognizedTaxBenefits	15.9us-gaap_UnrecognizedTaxBenefits	16.1us-gaap_UnrecognizedTaxBenefits
Assumed in acquisition		5.0
Increases in tax positions for prior years	0.3	1.1	0.6
Decreases in tax positions for prior years	(0.4)	(2.1)
Increases in tax positions for current year	3.8	3.6	4.1
Settlements	(0.1)	(3.5)	(1.1)
Lapses in statutes-of-limitation periods	(2.8)	(0.6)	(3.8)
Balance at the end of the period	20.2us-gaap_UnrecognizedTaxBenefits	19.4us-gaap_UnrecognizedTaxBenefits	15.9us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits, if recognized, would affect the effective tax rate	20.2
Accrued interest and penalties on uncertain tax positions	1.2	1.0
State
Income Taxes
Operating Loss Carryforwards	$ 3.2

Amount of deferred tax liability not recognized because of the exceptions to comprehensive recognition of deferred taxes related to undistributed earnings of foreign subsidiaries.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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