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Goodwill and Other Intangible Assets Textuals (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Amortization of Intangible Assets $ 11.5 $ 8.3 $ 6.3
Future Amortization Expense, Year One 13.9    
Future Amortization Expense, Year Two 13.4    
Future Amortization Expense, Year Three 13.0    
Future Amortization Expense, Year Four 12.4    
Future Amortization Expense, Year Five 11.9    
Amortization Of Acquired Intangible Asset Net Of Tax 10.9 7.4 5.7
Purchased Intangibles, Net of Tax 7.1 5.0 3.9
Capitalized Computer Software, Amortization $ 31.0 $ 27.5 $ 24.4
Minimum [Member]      
Finite-Lived Intangible Assets, Useful Life, Minimum 3 years    
Maximum [Member]      
Finite-Lived Intangible Assets, Useful Life, Minimum 45 years