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Employee Benefit Plans (Expected Future Minimum Payments) (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Pension Benefits  
Aggregate expected benefit payments  
2018 $ 47.6
2019 46.6
2020 48.5
2021 49.4
2022 50.0
2023 through 2027 271.6
Total 513.7
Postretirement Benefits  
Aggregate expected benefit payments  
2018 1.6
2019 1.7
2020 1.7
2021 1.8
2022 1.8
2023 through 2027 9.4
Total $ 18.0