Income Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended			24 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2015
Valuation Allowance [Line Items]
Net favorable adjustment	$ 13.0	$ 70.0		$ 83.0
One-time TCJA Transition Tax, additional expense	1.0	135.0
Additional tax benefit for deferred tax revaluation	14.0	205.0
Net deferred tax liabilities	523.4	317.5		523.4
Valuation allowance	40.3	26.2		40.3
Valuation allowance increase	14.0	1.0
Operating loss carryforwards	668.0			668.0
Operating loss carryforward tax benefit	112.0			112.0
Operating loss carryforwards tax benefit valuation allowance	26.0			26.0
Tax credit carryforward	19.0			19.0
Income taxes paid	89.0	196.0	$ 110.0
Unrecognized tax benefits, gross	133.4	59.0	$ 28.6	133.4	$ 169.9
Unrecognized tax benefits, net	144.0	69.0		144.0
Indirect tax benefits	5.0	4.0		5.0
Income tax interest and penalties	16.0	14.0		16.0
Potential income tax interest and penalties	4.0
Foreign earnings expected to be repatriated	275.0
Foreign earnings liability	0.0			0.0
Foreign earnings reinvested indefinitely	2,200.0			2,200.0
Domestic Tax Authority
Valuation Allowance [Line Items]
Net deferred tax liabilities	559.0	340.0		559.0
Valuation allowance	13.0	12.0		13.0
Operating loss carryforwards	281.0			281.0
Foreign Tax Authority
Valuation Allowance [Line Items]
Valuation allowance	27.0	14.0		27.0
Net deferred tax assets	36.0	$ 22.0		36.0
Operating loss carryforwards	184.0			184.0
State and Local Jurisdiction
Valuation Allowance [Line Items]
Operating loss carryforwards	203.0			203.0
Separation Related
Valuation Allowance [Line Items]
Valuation allowance for tax credit carryforward	$ 12.0			$ 12.0