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Goodwill and Other Intangible Assets (Weighted-Average Amortization Period) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Acquired Finite-Lived Intangible Assets [Line Items]      
Weighted-average amortization period (in years) 8 years 8 years 1 month 6 days  
Amortization expense $ 7.2 $ 6.1 $ 5.2
Customer Relationships [Member]      
Acquired Finite-Lived Intangible Assets [Line Items]      
Weighted-average amortization period (in years) 9 years 110 days 9 years 3 months 18 days  
Trade Names [Member]      
Acquired Finite-Lived Intangible Assets [Line Items]      
Weighted-average amortization period (in years) 2 years 292 days 2 years 10 months 24 days  
Developed Technology [Member]      
Acquired Finite-Lived Intangible Assets [Line Items]      
Weighted-average amortization period (in years) 6 years 110 days 6 years 4 months 24 days