Postretirement Benefit Plans - Summary of Funded Status (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0.3	$ 0.3	$ 0.4
Projected benefit obligation	130.0	129.6	150.6
Funded status	(129.7)	(129.3)
Amounts reported within:
Non-current assets	0.2	0.1
Accrued liabilities	(9.8)	(10.4)
Non-current liabilities	(120.0)	(119.0)
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.3	0.3
Projected benefit obligation	71.4	71.6
Funded status	(71.1)	(71.3)
Amounts reported within:
Non-current assets	0.2	0.1
Accrued liabilities	(4.8)	(5.0)
Non-current liabilities	(66.4)	(66.4)
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	58.6	58.0	$ 66.2
Funded status	(58.6)	(58.0)
Amounts reported within:
Non-current assets	0.0	0.0
Accrued liabilities	(5.0)	(5.4)
Non-current liabilities	$ (53.6)	$ (52.6)