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Pension and Postretirement Benefits - Expected Benefit Payments (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 96.0
2022 97.4
2023 99.3
2024 100.3
2025 101.1
2026 - 2030 510.2
Postretirement Benefit Obligations  
Defined Benefit Plan Disclosure [Line Items]  
2021 0.3
2022 0.2
2023 0.2
2024 0.2
2025 0.2
2026 - 2030 $ 0.6