Property And Equipment, Net (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Property And Equipment, Net [Abstract]
Depreciation expense	$ 64.1	$ 69.5
Non-cash capital expenditures	$ 4.7		$ 7.0