Debt and Credit Arrangements - Interest Expense and Financing Cost Amortization (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Line of Credit Facility
Interest expense, debt	$ 299.0
Financing costs amortization	17.2	$ 2.9	$ 8.3
Revolving Credit Facility
Line of Credit Facility
Interest expense, debt	147.2	23.4	9.0
Financing costs amortization	5.9	1.9	7.4
Revolving Credit Facility | Senior Secured Revolving Credit Facilities due 2026
Line of Credit Facility
Interest expense, debt	27.7	23.4	2.5
Financing costs amortization	2.3	1.9	0.4
Revolving Credit Facility | Term Long due June 2024
Line of Credit Facility
Interest expense, debt	0.0	0.0	1.8
Financing costs amortization	0.0	0.0	2.9
Revolving Credit Facility | Term Loan 2030 Credit Facility
Line of Credit Facility
Interest expense, debt	119.5	0.0	0.0
Financing costs amortization	3.6	0.0	0.0
Revolving Credit Facility | Senior Secured Revolving Credit Facility And Term Loan 2024 Credit Facility
Line of Credit Facility
Financing costs amortization	0.0	0.0	3.8
Revolving Credit Facility | Senior Secured Revolving Credit Facilities due 2024
Line of Credit Facility
Interest expense, debt	0.0	0.0	4.7
Revolving Credit Facility | Senior Secured Revolving Credit Facility 2024
Line of Credit Facility
Financing costs amortization	$ 0.0	$ 0.0	$ 0.3