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Property and Equipment - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Property, Plant and Equipment [Abstract]        
Depreciation $ 28.0 $ 26.5 $ 56.7 $ 52.6