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Employee Benefit Plans (Expected Future Benefit Payments) (Details) $ in Millions | Dec. 31, 2017 USD ($)
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Pension Benefits [Member] |
Summary of expected future benefit payments |
2018 | $ 21.8
2019 | 19.3
2020 | 19.9
2021 | 26.0
2022 | 20.4
2023-2027 | 146.4
Other Benefits [Member] |
Summary of expected future benefit payments |
2018 | 0.5
2019 | 0.5
2020 | 0.4
2021 | 0.3
2022 | 0.3
2023-2027 | $ 0.9

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