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Retirement Benefits - Estimated Future Benefit Payments (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 42.9
2019 44.4
2020 46.1
2021 47.6
2022 49.8
2023-2027 267.2
Other Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2018 2.4
2019 2.3
2020 2.2
2021 2.2
2022 2.0
2023-2027 $ 8.8