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Retirement Benefits Estimated Future Benefit Payments (Details)
$ in Millions
Dec. 31, 2015
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2016 $ 42.3
2017 43.8
2018 45.7
2019 47.4
2020 49.3
2021-2025 278.2
Other Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2016 2.3
2017 2.3
2018 2.3
2019 2.2
2020 2.1
2021-2025 $ 9.5