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Pension and Other Postretirement Benefit Plans - Estimated Future Benefit Payments (Details) $ in Millions | Dec. 31, 2018 USD ($)
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Pension [Member] |
Estimated Future Benefit Payments [Abstract] |
2019 | $ 47.9
2020 | 47.4
2021 | 47.3
2022 | 47.1
2023 | 47.0
Years 2024 - 2028 | 231.1
Postretirement Health and Life [Member] |
Estimated Future Benefit Payments [Abstract] |
2019 | 9.7
2020 | 9.7
2021 | 9.8
2022 | 9.8
2023 | 9.7
Years 2024 - 2028 | $ 51.1

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