Postretirement Benefit Plans - Summary of Funded Status (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0.3	$ 0.4	$ 0.4
Projected benefit obligation	129.6	150.6	149.8
Funded status	(129.3)	(150.2)
Amounts reported within:
Non-current assets	0.1	0.2
Accrued liabilities	(10.4)	(11.7)
Non-current liabilities	(119.0)	(138.7)
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.3	0.4
Projected benefit obligation	71.6	84.4
Funded status	(71.3)	(84.0)
Amounts reported within:
Non-current assets	0.1	0.2
Accrued liabilities	(5.0)	(5.5)
Non-current liabilities	(66.4)	(78.7)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0	0.0
Projected benefit obligation	58.0	66.2	$ 70.7
Funded status	(58.0)	(66.2)
Amounts reported within:
Non-current assets	0.0	0.0
Accrued liabilities	(5.4)	(6.2)
Non-current liabilities	$ (52.6)	$ (60.0)