Income Taxes (Details) - USD ($) $ in Millions			1 Months Ended	8 Months Ended
	Apr. 15, 2021	Feb. 05, 2021	Feb. 05, 2021	Sep. 30, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Deferred tax liabilities		$ 21.5	$ 21.5	$ 13.6
Valuation allowance		4.7	4.7	4.5
Deferred tax asset, net of valuation allowance				8.7
Reserves for uncertain tax positions				50.9	$ 42.5
Unrecognized tax benefits				0.3	$ 0.4
Tax expense (benefit) related to Non-US reserve			(1.7)	18.6
Income tax expense related to reorganization and fresh start adjustments		$ 2.5	2.5
Tax expenses related to various recurring items			$ 2.6	12.6
Decrease of acquiree's historical tax reserve	$ 18.4
Other tax adjustment related to acquisition	$ 2.9
Tax benefits related to US and Non-US reserve release				24.2
Tax benefits related to US tax refund				12.6
Tax benefit related to deferred tax adjustments				$ 1.2