Reorganizations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Reorganizations [Abstract]
Reorganization Items	$ 636.2	$ 0.0	$ 636.2	$ 0.0
Debtor Reorganization Items, Legal and Advisory Professional Fees			3.5
Debtor Reorganization Items, Debt Issuance Cost and Debt Discount, Writeoff			124.6
Debtor Reorganization Items, Debtor-in-Possession Facility Financing Costs			417.0
Debtor Reorganization Items, Gain (Loss) on Settlement of Other Claims, Net			91.0
Debtor Reorganization Items, Other Expense (Income)			0.1
Liabilities Subject to Compromise	$ 2,240.2		$ 2,240.2		$ 0.0