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Pension and Other Postretirement Benefits - Pension Plan Asset Allocation (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	100.00%	100.00%
Fair value of assets	$ 295.9	$ 261.7
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of assets	295.9	261.7
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	26.00%
Actual plan asset allocations	27.00%	25.00%
Fair value of assets	$ 78.5	$ 66.5
U.S. equities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of assets	78.5	66.5
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	22.00%
Actual plan asset allocations	23.00%	19.00%
Fair value of assets	$ 66.7	$ 49.0
International equities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of assets	66.7	49.0
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	52.00%
Actual plan asset allocations	50.00%	56.00%
Fair value of assets	$ 150.7	$ 146.2
Fixed income | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of assets	150.7	146.2
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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
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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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