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Goodwill and Other Intangible Assets Textuals (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Amortization of Intangible Assets $ 6.3 $ 6.5 $ 5.9
Future Amortization Expense, Year One 6.6    
Future Amortization Expense, Year Two 6.3    
Future Amortization Expense, Year Three 6.0    
Future Amortization Expense, Year Four 5.7    
Future Amortization Expense, Year Five 5.5    
Amortization Of Acquired Intangible Asset Net Of Tax 5.7 5.6 5.3
Purchased Intangibles, Net of Tax 3.9 3.9 3.6
Capitalized Computer Software, Amortization $ 24.4 $ 22.4 $ 18.6
Minimum [Member]      
Finite-Lived Intangible Assets, Useful Life, Minimum 3 years    
Maximum [Member]      
Finite-Lived Intangible Assets, Useful Life, Minimum 45 years