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Property and Equipment - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Property, Plant and Equipment [Abstract]        
Depreciation $ 95.0 $ 69.5 $ 189.9 $ 131.7