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Employee Benefit Plans (Expected Future Benefit Payments) (Details)
$ in Millions
Dec. 31, 2016
USD ($)
Pension Benefits [Member]  
Summary of expected future benefit payments  
2016 $ 18.7
2017 18.9
2018 19.2
2019 19.6
2020 24.9
2022-2026 135.1
Other Benefits [Member]  
Summary of expected future benefit payments  
2016 0.6
2017 0.5
2018 0.4
2019 0.4
2020 0.3
2022-2026 $ 1.1