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Retirement Benefits - Estimated Future Benefit Payments (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 52.1
2022 53.1
2023 53.5
2024 53.7
2025 53.9
2025-2028 262.9
Other Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2021 2.0
2022 1.9
2023 1.8
2024 1.7
2025 1.6
2025-2028 $ 6.9