Property and Equipment - Additional Disclosures (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Property, Plant and Equipment [Abstract]
Depreciation expense, inclusive of expense captured in cost of revenue	$ 3.2	$ 3.3	$ 10.0	$ 9.7