Employee Benefit Plans and Other Postretirement Benefits - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Pension Contributions [Abstract]
Expected contribution to qualified plans (at least)	$ 19.8		$ 19.8
Pension Plans | Qualified Plan
Pension Contributions [Abstract]
Contributions to pension plan	$ 7.2	$ 3.9	$ 11.1	$ 4.6