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Retirement Benefits - Expected Future Benefit Payments (Details)
$ in Millions
Mar. 31, 2020
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 38.4
2022 38.5
2023 38.3
2024 38.4
2025 37.7
2026 - 2030 180.6
Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2021 1.6
2022 1.5
2023 1.4
2024 1.3
2025 1.3
2026 - 2030 $ 5.4