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Debt - Components of debt (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Apr. 06, 2021	Jan. 02, 2020
Debt Instrument [Line Items]
Finance leases	$ 14.8	$ 19.1
Total debt, gross	514.8	555.9
Less: unamortized debt issuance costs	(4.6)	(5.3)
Total debt	510.2	550.6
Term loan
Debt Instrument [Line Items]
Term loan	0.0	136.8		$ 150.0
Senior notes | Unsecured Debt
Debt Instrument [Line Items]
Term loan	400.0	400.0	$ 400.0
Revolving Credit Facility | Revolving credit facility
Debt Instrument [Line Items]
Revolving credit facility	100.0	$ 0.0
Less: unamortized debt issuance costs	$ (2.5)

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

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Present value of lessee's discounted obligation for lease payments from finance lease.

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Amount of long-term debt and lease obligation, including portion classified as current.

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The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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