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Debt - Components of debt (Details) - USD ($) $ in Millions	Dec. 31, 2024	Oct. 01, 2024	Aug. 26, 2024	Dec. 31, 2023	Apr. 06, 2021
Debt Instrument [Line Items]
Finance leases	$ 7.1			$ 13.1
Debt and finance leases	1,707.1			573.1
Less: unamortized debt issuance costs	(18.2)			(4.4)
Total debt	1,688.9			568.7
Revolving credit facility | Revolving credit facility
Debt Instrument [Line Items]
Revolving credit facility	0.0			160.0
Less: unamortized debt issuance costs	(3.7)
Term Loan
Debt Instrument [Line Items]
Long-term debt, gross	700.0	$ 700.0		0.0
Senior Notes due 2029 | Unsecured Debt
Debt Instrument [Line Items]
Long-term debt, gross	400.0			400.0	$ 400.0
Senior Notes due 2032 | Unsecured Debt
Debt Instrument [Line Items]
Long-term debt, gross	$ 600.0		$ 600.0	$ 0.0

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Amount of short-term and long-term debt and lease obligation.

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