Income Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Provision (benefit) from income taxes	$ 42.6	$ (25.0)	$ (120.5)
Decrease in valuation allowance	23.1
Valuation allowance	183.5	206.6
Unrecognized tax benefits	26.9	23.5	26.3	$ 21.1
Change in unrecognized tax benefits is reasonably possible	4.4
Accrued interest and penalties	8.6	10.1
Expense for interest and penalties	(1.5)	(1.2)	$ (2.5)
Undistributed earnings	6,500.0	2,800.0
Deferred tax liabilities	16.9
Operating loss carryforwards	149.5	191.0
Tax credit carryforwards, foreign	4.0	8.2
Disallowance carryforwards	76.8	$ 54.1
United States
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	23.0
Other countries
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 126.5