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Retirement Benefits Retirement Benefits - Schedule of Projected Payments Venezuela (Details) - Non-U.S. Plans
$ in Millions
Dec. 31, 2017
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 11.5
2019 11.3
2020 11.7
2021 13.0
2022 13.3
2023 through 2027 86.8
Venezuela  
Defined Benefit Plan Disclosure [Line Items]  
2018 0.8
2019 4.7
2020 40.5
2021 354.6
2022 3,243.4
2023 through 2027 $ 38,740,810.4