Income Taxes - Rate Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Dec. 31, 2015	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Rate Reconciliation [Abstract]
U.S. federal tax rate		21.00%	21.00%	35.00%
Venezuela deconsolidation and devaluation		0.00%	62.40%	0.00%
Foreign rate differential		17.30%	39.30%	(3.70%)
Taxes on cross border income, net of credits		9.30%	22.60%	2.60%
Tax on accelerated U.S. income(a)		(7.90%)	0.00%	(0.20%)
Adjustments to valuation allowances		16.00%	13.10%	3.40%
Foreign income taxes		13.70%	18.90%	5.10%
Tax reform		0.00%	(4.90%)	47.40%
French business tax		3.00%	8.00%	2.00%
State income taxes, net		(2.20%)	(1.30%)	(1.30%)
Share-based compensation		(4.80%)	(14.40%)	(3.50%)
Other		(0.20%)	0.00%	0.10%
Actual income tax rate on continuing operations		65.20%	164.70%	86.90%
Accelerated U.S. income tax expense	$ 23.5	$ 7.3		$ 0.4

Effective Income Tax Rate Reconciliation, Deconsolidation and Devaluation of Equity Investment, Percent

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Effective Income Tax Rate Reconciliation, Domestic Accelerated income, Amount

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Effective Income Tax Rate Reconciliation, Domestic Accelerated income, Percent

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Effective Income Tax Rate Reconciliation, Foreign income taxes, percent

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Effective Income Tax Rate Reconciliation, Taxes on cross border income, net of credits, percent

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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