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Pension and Savings Plans Estimated Future Benefit Payments (Details) - Successor - Pension Plan [Member] $ in Millions | Dec. 31, 2017 USD ($)
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Estimated Future Benefit Payments |
2018 | $ 57.2
2019 | 57.2
2020 | 58.6
2021 | 59.5
2022 | 58.9
Years 2023-2027 | $ 280.1

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