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Debt and Credit Arrangements - Notes Interest Accretion Schedule (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	Dec. 22, 2022
Debt Instrument
Interest expense, debt	$ 80.3		$ 128.5
Revolving Credit Facility
Debt Instrument
Interest expense, debt	$ 46.0	$ 5.0	$ 54.1	$ 8.3
Senior secured revolving credit facility due October 2026 | Revolving Credit Facility
Debt Instrument
Debt instrument stated interest rate (percent)	6.20%		6.20%		3.40%
Interest expense, debt	$ 11.8	5.0	$ 14.4	8.3
Term Loan Due 2030 | Revolving Credit Facility
Debt Instrument
Interest expense, debt	34.2	$ 0.0	39.7	$ 0.0
Secured And Unsecured Debt
Debt Instrument
Interest accretion of senior notes discount	0.7		1.4
Interest expense, debt	$ 40.2		$ 80.4
Secured Debt | Senior Secured Notes Due 2030
Debt Instrument
Debt instrument stated interest rate (percent)	7.50%		7.50%			7.50%
Interest expense, debt	$ 27.4		$ 54.8
Unsecured Debt | Senior Unsecured Notes Due 2031
Debt Instrument
Debt instrument stated interest rate (percent)	9.50%		9.50%			9.50%
Interest expense, debt	$ 12.1		$ 24.2

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