Goodwill And Other Intangible Assets (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense of intangible assets	$ 3.3	$ 3.5
Finite-Lived Intangible Assets, Amortization Expense, Next Rolling Twelve Months	9.6
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