Property And Equipment - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Property, Plant and Equipment [Abstract]
Capital lease obligation period			5 years
Amortization of assets held under capital leases	$ 8.6	$ 10.2	$ 27.4	$ 31.4