Retirement and Postretirement Plans - Summary of Components of Net Periodic Benefit Cost (Credit) for Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1.1	$ 1.1	$ 1.0
Interest cost	46.8	40.2	63.6
Expected return on plan assets	(90.9)	(110.9)	(108.8)
Amortization of prior service costs	(0.2)	(0.2)
Amortization of net loss	0.3	1.2
Settlement gain recognized		(12.5)	(1.6)
Net periodic benefit cost (credit)	(42.5)	(80.7)	(45.8)
OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	0.5	0.4	0.6
Amortization of net loss	0.2	0.7	0.2
Net periodic benefit cost (credit)	$ 0.7	$ 1.1	$ 0.8