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Supplemental Information - Other Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Deferred compensation arrangements (Note 5)	$ 15.9	$ 15.5
Pension & OPEB liabilities (Note 14)	8.2	9.6
Unrecognized tax benefits (Note 17)	2.4	1.4
Litigation verdict accrual (Note 18)	91.4	87.4
Asset retirement obligations (Note 2)	7.4	7.4
Other	5.3	5.4
Other liabilities	$ 130.6	$ 126.7

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