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Goodwill And Other Intangible Assets (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]          
Amortization expense of intangible assets $ 3.3 $ 3.5 $ 6.6 $ 6.9  
Finite-Lived Intangible Assets, Amortization Expense, Next Rolling Twelve Months         $ 6.3
Finite-Lived Intangible Assets, Amortization Expense, Year Two         12.2
Finite-Lived Intangible Assets, Amortization Expense, Year Three         11.4
Finite-Lived Intangible Assets, Amortization Expense, Year Four         10.7
Finite-Lived Intangible Assets, Amortization Expense, Year Five         $ 10.1