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Goodwill and Other Intangibles (Narrative) (Details) - Other Intangible Assets - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Acquired Finite-Lived Intangible Assets [Line Items]        
Amortization expense related to other intangible assets $ 2.3 $ 2.2 $ 4.7 $ 4.3
Estimated future amortization expense for 2017 4.6   4.6  
Estimated future amortization expense for 2018 8.6   8.6  
Estimated future amortization expense for 2019 8.4   8.4  
Estimated future amortization expense for 2020 8.4   8.4  
Estimated future amortization expense for 2021 $ 5.9   $ 5.9