Pension, Health Care and Other Postretirement Benefits - Summary of the Components of Net Periodic Benefit Cost and Cumulative Other Comprehensive Loss Related to Postretirement Benefits Other than Pensions (Details) - Postretirement Benefits Other than Pensions - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net periodic benefit cost:
Service cost	$ 1.2	$ 1.4	$ 1.5
Interest cost	6.0	4.9	7.6
Amortization of actuarial losses	4.2	4.7	2.0
Amortization of prior service (credit) cost	(0.4)	0.3	(1.1)
Net periodic benefit cost	11.0	11.3	10.0
Other changes in projected benefit obligation recognized in AOCI (before taxes):
Net actuarial (gain) loss arising during the year	(54.5)	(4.1)	19.7
Prior service (credit) cost arising during the year	(62.8)	(2.2)	0.9
Amortization of actuarial losses	(4.2)	(4.7)	(2.0)
Amortization of prior service credit (cost)	0.4	(0.3)	1.1
Total recognized in AOCI	(121.1)	(11.3)	19.7
Total recognized in net pension cost and AOCI	$ (110.1)	$ 0.0	$ 29.7