Pension Plans and Other Postretirement Benefits - Pension and Postretirement Plan Contributions (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Retirement Benefits [Abstract]
Employer contributions	$ 2.5	$ 3.2	$ 8.9	$ 22.1
Payment for other postretirement benefits	$ 0.7	$ 0.7	$ 2.1	$ 2.1