Income Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Loss Carryforwards [Line Items]
Federal income tax at statutory rate (as a percent)		35.00%	35.00%	35.00%
Change in tax rate, income tax benefit		$ (6.5)
Income tax expense, Tax Reform Act mandatory repatriation of undistributed foreign subdidiary earnings and profits		54.0
Change in valuation allowance, deferred tax asset		113.8
Income tax reconciliation due to audit resolution		13.7
Undistributed earnings of consolidated non-U.S. subsidiaries		564.6
Cash and cash equivalents held by foreign subsidiaries		83.1
Change to gross unrecognized tax benefits including interest and penalties		(1.7)	$ 4.9	$ (1.9)
Uncertain tax liabilities interest and penalties		0.3	2.8	(0.5)
Uncertain tax liabilities interest and penalties accrued		7.7	7.4
Unrecognized tax benefits that would impact effective tax rate		13.1	$ 14.6	$ 9.9
Unrecognized tax benefits and income tax expense possibly reduced from audit resolutions during the next 12 months		9.0
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards		131.3
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards		657.3
Foreign Tax Authority
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards		396.5
Net operating loss carryforwards, valuation allowance		242.9
France
Operating Loss Carryforwards [Line Items]
Deferred tax assets, valuation allowance		40.2
Internal Revenue Service
Operating Loss Carryforwards [Line Items]
Change in enacted tax rate, amount		$ 68.9
Scenario Forecast
Operating Loss Carryforwards [Line Items]
Federal income tax at statutory rate (as a percent)	21.00%