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Pension and Other Postretirement Benefits - Schedule of Expected Benefit Payments (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Pension  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 58.0
2022 60.0
2023 61.0
2024 62.0
2025 63.0
2026-2030 339.0
SERP  
Defined Benefit Plan Disclosure [Line Items]  
2021 3.2
2022 3.2
2023 3.2
2024 3.2
2025 3.1
2026-2030 15.1
PBOP  
Defined Benefit Plan Disclosure [Line Items]  
2021 4.9
2022 5.0
2023 4.9
2024 4.9
2025 4.9
2026-2030 $ 24.0