Postretirement Benefit Plans - Summary of Funded Status (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0.4	$ 0.5	$ 0.5
Projected benefit obligation	149.8	214.3	242.8
Funded status	(149.4)	(213.8)
Amounts reported within:
Non-current assets	0.2	0.2
Accrued liabilities	(12.4)	(14.1)
Non-current liabilities	(137.2)	(199.9)
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.4	0.5
Projected benefit obligation	79.1	107.9
Funded status	(78.7)	(107.4)
Amounts reported within:
Non-current assets	0.2	0.2
Accrued liabilities	(5.6)	(5.5)
Non-current liabilities	(73.3)	(102.1)
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	70.7	106.4	$ 118.3
Funded status	(70.7)	(106.4)
Amounts reported within:
Non-current assets	0.0	0.0
Accrued liabilities	(6.8)	(8.6)
Non-current liabilities	$ (63.9)	$ (97.8)