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Pension and Other Post-Retirement Benefits - Pension Obligations, Plan Assets, and Other Post-retirement Obligations (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
Accumulative other comprehensive loss: |  |  |  |  |  |  |
After-tax amount recognized in accumulated other comprehensive loss | $ 77.4 |  | $ 77.4 |  | $ 79.7 | $ 83.2 | $ 85.4
Defined Benefit Pension [Member] |  |  |  |  |  |  |
Change in Benefit Obligation |  |  |  |  |  |  |
Service cost | 2.0 | $ 1.7 | 6.0 | $ 4.9 |  |  |
Interest cost | 3.1 | 3.8 | 9.2 | 11.4 |  |  |
Accumulative other comprehensive loss: |  |  |  |  |  |  |
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | (5.0) | (5.6) | (15.1) | (16.6) |  |  |
Defined Benefit Plan, Amortization of Gain (Loss) | 3.1 | 2.0 | 9.5 | 6.0 |  |  |
Retiree Health and Life [Member] |  |  |  |  |  |  |
Change in Benefit Obligation |  |  |  |  |  |  |
Service cost | 0.0 | 0.0 | 0.1 | 0.1 |  |  |
Interest cost | 0.1 | 0.2 | 0.4 | 0.7 |  |  |
Accumulative other comprehensive loss: |  |  |  |  |  |  |
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | 0.0 | 0.0 | 0.0 | 0.0 |  |  |
Defined Benefit Plan, Amortization of Gain (Loss) | $ (0.1) | $ 0.0 | $ (0.3) | $ (0.1) |  |  |

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