Income Taxes (Income Taxes) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current expense:
Federal	$ 17.4	$ 16.0	$ 7.5
State	0.8	1.5	0.8
Foreign	6.2	4.2	4.4
Total	24.4us-gaap_CurrentIncomeTaxExpenseBenefit	21.7us-gaap_CurrentIncomeTaxExpenseBenefit	12.7us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred expense (benefit):
Federal	1.0	1.2	7.5
State	(0.8)	(2.6)	(0.2)
Foreign	0.3	(0.9)	0.3
Total	0.5us-gaap_DeferredIncomeTaxExpenseBenefit	(2.3)us-gaap_DeferredIncomeTaxExpenseBenefit	7.6us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax expense	$ 24.9us-gaap_IncomeTaxExpenseBenefit	$ 19.4us-gaap_IncomeTaxExpenseBenefit	$ 20.3us-gaap_IncomeTaxExpenseBenefit

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