Employee Benefit Plans and Other Postretirement Benefits - Additional Information (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) (Pre-Tax):
Accumulated benefit obligation for plans with obligations in excess of plan assets	$ 42.9	$ 1,100.0
Defined Benefit Plan, Pension Plan Benefit Obligation in Excess of Plan Assets, Plan Assets	$ 334.3	1,200.0
Weighted-Average expected return on plan assets for 2021	5.80%
Pension Contributions [Abstract]
Contributions to pension plan	$ 50.0	$ 50.0	$ 50.0
Company's common stock	1.1	1.2
Deferred compensation liability	$ 31.0	$ 22.8
Defined Benefit Plan, Plan Assets, Amount	$ 267.2	1,100.0
Minimum
Pension Contributions [Abstract]
Company's contribution to pension plan, percentage	3.00%
Maximum
Pension Contributions [Abstract]
Company's contribution to pension plan, percentage	5.00%
OPEB plans
Pension Contributions [Abstract]
Defined Benefit Plan, Accumulated Benefit Obligation	$ 10.5	$ 9.5
Pension Plans
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) (Pre-Tax):
Weighted-Average expected return on plan assets for 2021	5.52%	4.08%	4.91%
Pension Contributions [Abstract]
Contributions to pension plan	$ 51.5	$ 51.3
Defined Benefit Plan, Plan Assets, Amount	1,161.6	1,055.3	$ 1,382.7
Defined Benefit Plan, Accumulated Benefit Obligation	1,173.3	1,131.0
Matching Contributions
Pension Contributions [Abstract]
Company's contribution to defined contribution plans	45.2	44.3	38.2
Service Related Contributions
Pension Contributions [Abstract]
Company's contribution to defined contribution plans	$ 45.4	$ 43.7	$ 46.4