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Employee Benefit Plans (Expected Future Benefit Payments) (Details)
$ in Millions
Dec. 31, 2015
USD ($)
Pension Benefits [Member]  
Summary of expected future benefit payments  
2016 $ 18.4
2017 18.8
2018 19.3
2019 19.8
2020 20.5
2021-2025 145.8
Other Benefits [Member]  
Summary of expected future benefit payments  
2016 0.8
2017 0.7
2018 0.6
2019 0.6
2020 0.5
2021-2025 $ 1.5