Goodwill And Intangible Assets (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 33.1	$ 30.9
Estimated future amortization expense in year 2018	151.8
Estimated future amortization expense in year 2019	104.1
Estimated future amortization expense in year 2020	55.2
Estimated future amortization expense in year 2021	40.4
Estimated future amortization expense in year 2022	33.5
Estimated future amortization expense thereafter	$ 111.1
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	1 year
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	20 years