Other (Expense) Income, Net - Components of Other income, Net (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Other Income and Expenses [Abstract]
Interest income		$ 1.2	$ 0.2	$ 2.1	$ 0.6
Net periodic postretirement benefit cost		(1.5)	(1.9)	(1.8)	(3.9)
Unrealized gain on equity securities		0.1	0.2	0.3	0.3
(Loss) gain on disposition of property, plant and equipment		(0.3)	(0.8)	(0.5)	14.2
Gain on business interruption insurance recoveries	[1]	0.0	0.0	10.5	0.0
All other, net		0.0	(0.2)	(0.2)	(0.1)
Other (expense) income, net		$ (0.5)	$ (2.5)	$ 10.4	$ 11.1

[1] Represents advances against business interruption insurance claims received by the Company as of June 30, 2024. We recognize such advances in the period in which the insurance proceeds are received or become realizable.