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Retirement Benefits - Expected Future Benefit Payments (Details)
$ in Millions
Mar. 31, 2019
USD ($)
Pension Benefits:  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 45.1
2021 39.8
2022 39.7
2023 39.5
2024 39.8
2025 - 2029 190.2
Other Postretirement Benefits:  
Defined Benefit Plan Disclosure [Line Items]  
2020 1.7
2021 1.6
2022 1.5
2023 1.4
2024 1.4
2025 - 2029 $ 5.8