Other (Expense) Income, Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Other Income and Expenses [Abstract]
Interest income	$ 0.2	$ 0.2	$ 0.6	$ 0.2
Net periodic postretirement benefit cost	(1.9)	(1.5)	(3.9)	(2.9)
Unrealized gain (loss) on equity securities	0.2	(0.7)	0.3	(1.1)
(Loss) gain on disposition of property, plant and equipment	(0.8)		14.2	(2.1)
All other, net	(0.2)	(1.7)	(0.1)	(1.5)
Other (expense) income, net	$ (2.5)	$ (3.7)	$ 11.1	$ (5.3)