Goodwill And 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
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 33.8	$ 31.7	$ 66.9	$ 62.5
Estimated future amortization expense in year 2018	174.8		174.8
Estimated future amortization expense in year 2019	96.7		96.7
Estimated future amortization expense in year 2020	55.7		55.7
Estimated future amortization expense in year 2021	40.3		40.3
Estimated future amortization expense in year 2022	31.6		31.6
Estimated future amortization expense thereafter	$ 110.0		$ 110.0
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