Income Taxes - Reconciliation Of The U.S. Federal Statutory Income Tax Rate (Details) - USD ($) $ in Millions		12 Months Ended
	Jul. 06, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Taxes [Line Items]
U.S. federal statutory rate (as a percent)		21.00%	21.00%	21.00%
Increase (decrease) resulting from:
State and local taxes, net of federal tax benefit		(1.40%)	(2.60%)	(1.00%)
Impact of U.S. Tax Reform and related effects		0	0	0.047
Impact of foreign operations		7.60%	3.80%	(1.20%)
Impact of U.S. tax method changes		0.00%	0.00%	(6.40%)
Impact of the Domestication	(35.70%)	(35.70%)	0.00%	0.00%
Change in valuation allowance and related effects		(24.40%)	1.80%	0.60%
Non-deductible share-based compensation costs		1.70%	(0.50%)	(0.50%)
U.S. federal R&D credit		(3.60%)	(3.70%)	(1.10%)
Nondeductible officer compensation		1.10%	1.50%	0.40%
Other		(0.10%)	1.40%	0.10%
Total		(33.80%)	22.70%	16.60%
Expense (benefit) for reduction in deferred tax liability for undistributed foreign earnings, amount				$ 31.8
Expense (benefit) for reduction in deferred tax liability for undistributed foreign earnings, percent				4.20%
Executive compensation deduction				$ 1.8
Executive compensation deduction, percent				0.30%
Expense for mandatory repatriation tax, amount				$ 1.5
Expense for mandatory repatriation tax, percent				0.002
Impact of U.S. tax method changes				$ 48.2
Recognition of deferred tax assets, net	$ 63.0
Change in valuation allowance, benefit		$ 49.4
Change in valuation allowance, benefit, percent		28.00%
Foreign
Increase (decrease) resulting from:
Change in valuation allowance, benefit		$ 61.8	$ 11.2	$ 135.2
Change in valuation allowance, benefit, percent		35.00%	4.00%	17.90%
Change in valuation allowance, expense		$ 61.8	$ 11.2	$ 135.2
Change in valuation allowance, expense, percent		35.00%	4.00%	17.90%