Goodwill And Intangible Assets (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Line Items]
Risk-adjusted discount rate	10.80%
Amortization	$ 244.5	$ 17.5	$ 23.4
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Amortization expense, 2018	173.5
Amortization expense, 2019	124.1
Amortization expense, 2020	114.8
Amortization expense, 2021	109.1
Amortization expense, 2022	106.6
Amortization expense, Thereafter	$ 705.7
Minimum
Goodwill [Line Items]
Reporting unit, percentage of fair value in excess of carrying amount	15.00%
Maximum
Goodwill [Line Items]
Reporting unit, percentage of fair value in excess of carrying amount	200.00%