Derivative Instruments - Notional amounts and fair value (Details) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2024 USD ($) contract	Mar. 31, 2024 USD ($) agreement	Sep. 30, 2024 USD ($) contract
Derivatives
Fair value of derivative instrument, current liability	$ 2.5		$ 2.5
Change in fair value of derivative instruments			10.9
Fair value of interest rate swap	$ 2.5		$ 2.5
Interest rate swaps \| Not designated as a hedge
Derivatives
Number of interest rate swap agreements entered into \| agreement		5
Number of contracts \| contract	5		5
Long-term debt not including unamortized debt issuance costs and discount	$ 954.9		$ 954.9
Notional amount	500.0		500.0
Fair value of derivative instrument, current liability	$ 2.5		$ 2.5
Derivative Liability, Current, Statement of Financial Position	Accrued liabilities and other		Accrued liabilities and other
Fair value of derivative instrument, non-current liability	$ 8.4		$ 8.4
Derivative Liability, Noncurrent, Statement of Financial Position	Other non-current liabilities		Other non-current liabilities
Change in fair value of derivative instruments	$ 11.6		$ 10.9
Amount of cash receipts	1.3		2.9
Fair value of interest rate swap	$ 2.5		$ 2.5
Derivative Liability, Current, Statement of Financial Position	Accrued liabilities and other		Accrued liabilities and other
Derivative Liability, Current, Statement of Financial Position	Accrued liabilities and other		Accrued liabilities and other
Interest rate swaps \| Not designated as a hedge \| Average
Derivatives
Percentage rate			4.30%
Each individual interest rate swap \| Not designated as a hedge
Derivatives
Notional amount		$ 100.0

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-SubTopic 10
-Name Accounting Standards Codification
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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Indicates line item in statement of financial position that includes derivative liability classified as current.

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Indicates line item in statement of financial position that includes derivative liability classified as noncurrent.

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- Definition

The number of derivative instruments of a particular derivative liability or group of derivative liabilities held by the entity.

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Nominal or face amount used to calculate payment on derivative.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Specified percentage rate at which percentage of entity's term loan variable rate exposure is fixed.

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- Definition

Number of interest rate swap arrangements entered into during the period.

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- Definition

Amount of proceeds as an offset to increase (decrease) in the fair value of derivatives recognized in the income statement.

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