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Goodwill and Intangible Assets (Intangible Assets, Estimated Amortization Expense) (Details)
$ in Millions
Dec. 31, 2015
USD ($)
Estimated Future Amortization Expense:  
2016 $ 1.3
2017 1.1
2018 1.0
2019 0.9
2020 0.4
Thereafter $ 4.2