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Retirement Benefits - Estimated Future Pension Benef Pmts (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Total  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 62.6
2019 63.3
2020 63.3
2021 64.5
2022 64.8
2023 through 2027 343.5
U.S. Plans  
Defined Benefit Plan Disclosure [Line Items]  
2018 51.1
2019 52.0
2020 51.6
2021 51.5
2022 51.5
2023 through 2027 256.7
Non-U.S. Plans  
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