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Employee Benefits Schedule of Expected Benefit Payments for Pension and Other Postretirement Benefits (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Pension Plan and SERP [Member]  
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]  
2019 $ 15.1
2020 8.9
2021 9.0
2022 7.6
2023 7.5
2025 through 2029 31.8
Medical Plan [Member]  
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]  
2019 0.2
2020 0.2
2021 0.2
2022 0.2
2023 0.1
2025 through 2029 $ 0.5