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Employee Benefits (Future Contributions) (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Retirement Benefits [Abstract]  
Expected employer contribution in next fiscal year $ 9.9
Expected benefit payments  
2019 86.7
2020 82.8
2021 80.2
2022 78.1
2023 75.6
2023-2027 $ 353.0