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Goodwill and Intangible Assets (Intangible Assets, Estimated Amortization Expense) (Details)
$ in Millions
Dec. 31, 2016
USD ($)
Estimated Future Amortization Expense:  
2016 $ 0.4
2017 0.4
2018 0.4
2019 0.4
2020 0.2
Thereafter $ 5.5