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Employee Benefit Plans (Expected Future Minimum Payments) (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Pension Benefits  
Aggregate expected benefit payments  
2020 $ 47.0
2021 49.7
2022 50.3
2023 50.3
2024 51.0
2025 through 2029 278.3
Total 526.6
Postretirement Benefits  
Aggregate expected benefit payments  
2020 1.6
2021 1.7
2022 1.7
2023 1.7
2024 1.7
2025 through 2029 8.6
Total $ 17.0