Income Taxes Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Valuation Allowance [Line Items]
Transition tax expense	$ 135.0
Deferred tax asset benefit	205.0
Net deferred tax liabilities	358.4	$ 246.6
Valuation allowance	27.7	26.7
Valuation allowance increase	1.0
Operating loss carryforwards	226.0
Operating loss carryforward tax benefit	44.0
Operating loss carryforwards tax benefit valuation allowance	16.0
Tax credit carryforward	17.0
Income taxes paid	253.0	149.0
Unrecognized tax benefits, gross	59.0	28.6	$ 169.9	$ 167.2
Unrecognized tax benefits, net	69.0	35.0
Indirect tax benefits	4.0	7.0
Income tax interest and penalties	14.0	13.0
Potential income tax interest and penalties	2.0		$ 8.0
Foreign earnings expected to be repatriated	275.0
Foreign earnings liability	6.0
Foreign earnings reinvested indefinitely	1,225.0
Domestic Tax Authority [Member]
Valuation Allowance [Line Items]
Net deferred tax liabilities	375.0	293.0
Valuation allowance	12.0	16.0
Operating loss carryforwards	78.0
Foreign Tax Authority [Member]
Valuation Allowance [Line Items]
Valuation allowance	16.0	11.0
Net deferred tax assets	17.0	$ 46.0
Operating loss carryforwards	108.0
State and Local Jurisdiction [Member]
Valuation Allowance [Line Items]
Operating loss carryforwards	40.0
Separation Related [Member]
Valuation Allowance [Line Items]
Tax credit carryforward	$ 12.0