Income Taxes (as restated) - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Taxes at U.S. statutory rate (21%)									$ (53.5)	$ (21.9)	$ (56.9)
State and local taxes, net of federal tax benefit									(4.9)	(4.0)	(6.0)
Non-U.S. rate differential									4.6	4.3	4.2
Non-U.S. tax holidays									(9.2)	(4.6)	(1.8)
Uncertain tax positions									16.4	16.0	21.5
Tax Cuts and Jobs Act of 2017									0.0	0.0	(14.1)
Global intangible low-tax income inclusion									15.4	13.8	4.2
Change in valuation allowances									82.1	17.0	104.7
Taxes on undistributed foreign earnings and withholding/ dividend taxes									9.8	8.5	(2.3)
U.S. implications of non-U.S. earnings									(2.6)	(1.8)	12.3
R&D deduction/ credit									(7.9)	(2.2)	(11.8)
Non-taxable settlement of contingent consideration									0.0	0.0	(3.2)
Change in fair value of warrant liabilities									30.2	0.0	0.0
Other permanent differences									4.9	6.7	10.5
Impact of rate changes in non-U.S. jurisdictions									(2.6)	4.8	(1.3)
Outside basis difference on divestiture									0.0	0.0	(6.6)
Impact of transaction costs									(4.8)	0.0	0.0
Other									(5.2)	(0.1)	(3.5)
Income tax expense	$ 20.2	$ 24.5	$ 14.3	$ 13.8	$ 5.6	$ (3.6)	$ 16.0	$ 18.5	$ 72.7	$ 36.5	$ 49.9