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Employee Benefit Plans and Other Postretirement Benefits - Summary of Changes in Pension Plans' Level 3 Assets (Details) - Pension Plans $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Level 3 fair value of pension plans' assets [Roll Forward]
Plan assets at fair value at beginning of period	$ 1,073.8
Fair value of plan assets at plan year end	1,300.7
Significant unobservable input (Level 3) \| Private Equity Securities
Level 3 fair value of pension plans' assets [Roll Forward]
Plan assets at fair value at beginning of period	2.6
Sales	(0.6)
Fair value of plan assets at plan year end	$ 2.0

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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