Income Taxes - Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Valuation Allowance [Line Items]
Valuation allowances	$ (33.7)	$ (33.7)	$ (77.5)
Total gross unrecognized tax benefits	38.9	38.9	26.0	$ 14.0	$ 39.2
Deferred Other Tax Expense (Benefit)		5.3	0.0	0.0
Summary of variation of effective income tax rate from continuing operations from the statutory federal income tax rate
Income tax at the U.S. federal statutory rate		99.2	85.7	91.0
Adjustments:
State and local income taxes, net of federal tax benefit		7.4	6.8	3.1
Tax on foreign remittances and U.S. tax on foreign income		26.4	21.1	93.0
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount		6.0	0.0	0.0
Foreign losses without current tax benefits		3.2	3.7	8.9
Foreign earnings taxed at different rates including tax holidays		12.6	11.1	(18.0)
U.S. domestic manufacturing deduction		0.0	0.0	(3.9)
U.S. foreign tax credit		(18.3)	(21.2)	(104.2)
Accruals and settlements related to tax audits		11.1	(3.8)	(34.4)
SEC Schedule, 12-09, Valuation Allowances and Reserves, Increase (Decrease) Adjustment	$ 44.5	(44.5)	0.0	(12.6)
Other Tax Expense (Benefit)		0.0	(10.6)	35.3
Effective Income Tax Rate Reconciliation, Deduction, Amount		(5.0)	(2.4)	0.0
Other items, net		(5.7)	12.2	(0.6)
United States and foreign tax provision on income		$ 97.7	$ 102.6	$ 57.6
Effective Income Tax Rate Reconciliation, Percent		20.70%	25.10%	22.20%
EMEA [Member]
Adjustments:
SEC Schedule, 12-09, Valuation Allowances and Reserves, Increase (Decrease) Adjustment		$ 40.7