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Derivative Instruments - Notional amounts and fair value (Details) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2025 USD ($) contract	Mar. 31, 2025 agreement	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($) agreement	Jun. 30, 2025 USD ($) contract	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Derivatives
Fair Value of Accrued Liabilities and Other	$ 2.5				$ 2.5		$ 1.0
Change in fair value of derivative instruments					$ 3.4	$ (0.7)
Interest rate swaps \| Not designated as a hedge
Derivatives
Number of interest rate swap agreements entered into \| agreement		5		5
Number of contracts \| contract	5				5
Long-term debt not including unamortized debt issuance costs and discount	$ 1,045.1				$ 1,045.1
Notional amount	500.0				500.0
Fair Value of Accrued Liabilities and Other	$ 2.5				$ 2.5
Derivative Liability, Current, Statement of Financial Position	Accrued liabilities and other				Accrued liabilities and other
Fair Value Other Non-current Liabilities	$ 3.8				$ 3.8
Derivative Liability, Noncurrent, Statement of Financial Position	Other non-current liabilities				Other non-current liabilities
Change in fair value of derivative instruments	$ 0.6		$ (1.8)		$ 3.4	(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