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Retirement Benefits (Projected Benefit Payments) (Details) - Defined Benefit Pension Plan
$ in Millions
Sep. 30, 2017
USD ($)
U.S.  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 158.5
2019 163.4
2020 167.3
2021 171.4
2022 177.2
2023-2027 938.5
International  
Defined Benefit Plan Disclosure [Line Items]  
2018 50.9
2019 53.4
2020 53.8
2021 56.8
2022 59.3
2023-2027 $ 333.3