Derivative Instruments - Notional amounts and fair value (Details) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2024 USD ($) contract	Mar. 31, 2024 USD ($) agreement	Jun. 30, 2024 USD ($) contract
Derivatives
Change in fair value of derivative instruments			$ (0.7)
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	$ 956.7		$ 956.7
Notional amount	500.0		500.0
Fair value of derivative instrument, asset	$ 3.2		$ 3.2
Derivative Asset, Current, Statement of Financial Position	Prepaid expenses and other		Prepaid expenses and other
Fair value of derivative instrument, liability	$ 2.5		$ 2.5
Derivative Liability, Noncurrent, Statement of Financial Position	Other non-current liabilities		Other non-current liabilities
Change in fair value of derivative instruments	$ (1.8)		$ (0.7)
Amount of cash receipts	$ 1.2		$ 1.6
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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-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Indicates line item in statement of financial position that includes derivative asset classified as current.

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-SubTopic 10
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

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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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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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