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Retirement Benefits (Projected Benefit Payments) (Details) - Defined Benefit Pension Plan
$ in Millions
Sep. 30, 2019
USD ($)
U.S.  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 166.8
2021 160.0
2022 166.0
2023 170.1
2024 174.1
2025-2029 919.9
International  
Defined Benefit Plan Disclosure [Line Items]  
2020 47.9
2021 49.1
2022 50.1
2023 54.3
2024 58.0
2025-2029 $ 308.3