Income Taxes Narrative (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Tax Credit Carryforward [Line Items]
Income tax credits	$ 30.6	$ 31.3
Net operating loss carryforwards	46.3	53.1
Valuation allowance	34.3	28.5
Undistributed earnings of foreign subsidiaries	750
Amount of unrecognized deferred tax liability, undistributed earnings of foreign subsidiaries	150
Income taxes paid	125.4	127.2	113.2
Unrecognized tax benefits that would impact effective tax rate	17.8
Unrecognized tax benefits timing of deductibility unknown	0.5
Significant (increase) decrease in unrecognized tax benefits is reasonably possible, estimated range of change, upper bound	1.9
Unrecognized tax benefits, income tax penalties and interest expense	1.7	(0.2)	(0.5)
Unrecognized tax benefits, income tax penalties and interest accrued	2.9	1.2
Tax credit carryforward indefinitely
Tax Credit Carryforward [Line Items]
Income tax credits	9.1
Net operating loss carryforwards	17.7
Carryforward Subject To Expiration
Tax Credit Carryforward [Line Items]
Income tax credits	21.5
Net operating loss carryforwards	28.1
Federal, State, and Local
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards	$ 45.8