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Employee Benefit Plans (Expected Future Minimum Payments) (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Pension Benefits  
Aggregate expected benefit payments  
2019 $ 46.4
2020 47.9
2021 51.2
2022 50.7
2023 51.6
2024 through 2028 280.6
Total 528.4
Postretirement Benefits  
Aggregate expected benefit payments  
2019 1.5
2020 1.6
2021 1.6
2022 1.6
2023 1.7
2024 through 2028 8.5
Total $ 16.5