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Debt and Credit Arrangements - Interest Expense and Financing Cost Amortization (Details) - USD ($) $ in Millions		12 Months Ended
	Oct. 18, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Line of Credit Facility
Notes, interest accretion of senior notes discount		$ 0.0	$ 0.0	$ 8.0
Interest expense, debt		25.7	11.7	18.1
Financing costs amortization		2.9	8.3	4.3
Secured and unsecured debt
Line of Credit Facility
Notes, interest accretion of senior notes discount		0.1	0.0	0.0
Interest expense, debt		4.4	0.0	0.0
Senior secured notes due 2030 \| Secured debt
Line of Credit Facility
Interest expense, debt		3.0	0.0	0.0
Senior unsecured notes due 2031 \| Unsecured Debt
Line of Credit Facility
Interest expense, debt		1.3	0.0	0.0
Term long due June 2024
Line of Credit Facility
Write off of unamortized debt issuance costs	$ 3.7
Revolving Credit Facility
Line of Credit Facility
Interest expense, debt		23.4	9.0	7.0
Financing costs amortization		1.9	7.4	3.6
Revolving Credit Facility \| Senior secured revolving credit facilities due 2026
Line of Credit Facility
Interest expense, debt		23.4	2.5	0.0
Financing costs amortization		1.9	0.4	0.0
Revolving Credit Facility \| Term long due June 2024
Line of Credit Facility
Interest expense, debt		0.0	1.8	4.8
Financing costs amortization		0.0	2.9	3.6
Write off of unamortized debt issuance costs		0.0	3.8	0.0
Revolving Credit Facility \| Interest expense, senior secured revolving credit facilities due 2024
Line of Credit Facility
Interest expense, debt		0.0	4.7	2.2
Revolving Credit Facility \| Senior secured revolving credit facility 2024
Line of Credit Facility
Financing costs amortization	0.3	$ 0.0	$ 0.3	$ 0.0
Write off of unamortized debt issuance costs	$ 0.1