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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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