Retirement Plans - Amounts Recognized in Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Plan
Amortization of:
Net actuarial loss	$ 3.3	$ 3.7	$ 3.1
Amounts arising during the period:
Net actuarial (loss) gain	(8.4)	0.6	1.7
Total	(5.1)	4.3	4.8
Other Postretirement Benefit Plan
Amortization of:
Net actuarial loss	0.0	0.1	0.0
Amounts arising during the period:
Net actuarial (loss) gain	0.3	0.0	(0.2)
Total	$ 0.3	$ 0.1	$ (0.2)