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Pension and Other Postretirement Benefits - Pension Plan Asset Allocation (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	100.00%	100.00%
Fair value of assets	$ 318.8	$ 295.9
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of assets	318.8	295.9
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of assets	0.0	0.0
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of assets	$ 0.0	$ 0.0
U.S. equities
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage of assets	30.00%
Actual plan asset allocations	31.00%	27.00%
Fair value of assets	$ 98.4	$ 78.5
U.S. equities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of assets	98.4	78.5
U.S. equities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of assets	0.0	0.0
U.S. equities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of assets	$ 0.0	$ 0.0
International equities
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage of assets	26.00%
Actual plan asset allocations	27.00%	23.00%
Fair value of assets	$ 86.8	$ 66.7
International equities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of assets	86.8	66.7
International equities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of assets	0.0	0.0
International equities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of assets	$ 0.0	$ 0.0
Fixed income
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage of assets	44.00%
Actual plan asset allocations	42.00%	50.00%
Fair value of assets	$ 133.6	$ 150.7
Fixed income | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of assets	133.6	150.7
Fixed income | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of assets	0.0	0.0
Fixed income | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of assets	$ 0.0	$ 0.0

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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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Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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