Income Taxes - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
GILTI tax benefit	$ 40.4
Measurement period adjustment, income tax expense (benefit)			$ (41.8)
Tax benefit from GILTI			55.5
Measurement period adjustment, transition tax expense			13.7
Undistributed earnings of foreign subsidiaries	130.0
Accrued deferred tax liability on unrecognized earnings from foreign subsidiaries	17.4
Valuation allowance	199.1	$ 219.6
Decrease in valuation allowance	20.5
State operating loss carry forward	308.0
State tax credits	743.0
Foreign operating loss carry forward	220.0
Operating loss carryforward	224.0
Foreign tax credit carryovers	25.1
State tax credits (net of federal tax)	$ 3.6
Tax carry-forward period	10 years
Unrecognized tax benefits	$ 82.5	71.2	81.4	$ 90.3
Unrecognized tax benefits that would impact effective tax rate	82.5
Total unrecognized benefits expected to revers within the next twelve months	1.0
Interest and penalties related to unrecognized tax expense (benefits)	(2.4)	(2.9)	$ 0.4
Interest and penalties related to unrecognized tax benefits	$ 7.2	$ 9.6