Accumulated Other Comprehensive Income (Loss) - Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Loss) Included in Computation of Net Periodic Pension and Postretirement Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Prior Service Costs
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax		$ 0.1	$ 0.3	$ 0.5
Actuarial Losses
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	$ (0.6)	0.4	(1.9)	1.0
Employee Pension and Postretirement Benefits, Net of Tax
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	(0.6)	0.5	(1.6)	1.5
Tax (expense) benefit	0.2	(0.1)	0.4	(0.3)
Net of tax	$ (0.4)	$ 0.4	$ (1.2)	$ 1.2