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Pension and Other Postretirement Benefits - Future Benefit Payments (Details)
$ in Millions
Dec. 31, 2016
USD ($)
Pension Benefits  
Future service benefit payments  
2017 $ 20.7
2018 19.3
2019 22.1
2020 20.0
2021 21.4
Years 2022-2026 113.2
Postretirement Benefits Other than Pensions  
Future service benefit payments  
2017 4.3
2018 3.5
2019 3.8
2020 4.1
2021 4.1
Years 2022-2026 $ 16.9