Other Income, Net - Components of Other income, Net (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Other Income and Expenses [Abstract]
Interest income		$ 0.9	$ 0.4
Net periodic postretirement benefit cost		(0.3)	(2.0)
Unrealized gain on equity securities		0.2	0.1
(Loss) gain on disposition of property, plant and equipment		(0.2)	15.0
Gain on business interruption insurance recoveries	[1]	10.5	0.0
All other, net		(0.2)	0.1
Other income, net		$ 10.9	$ 13.6

[1] Represents advances against business interruption insurance claims. We recognize such advances in the period in which the insurance proceeds are received or become realizable. As of March 31, 2024, we received net cash proceeds of $9.7 million on the $10.5 million total gain recognized to date.