Property And Equipment, Net (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Property And Equipment, Net [Abstract]
Depreciation expense	$ 66.9	$ 71.6	$ 136.4	$ 152.0
Non-cash capital expenditures			$ 6.6		$ 9.5