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Property and Equipment - Narrative (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Property, Plant and Equipment [Abstract]        
Depreciation $ 26.7 $ 26.4 $ 79.3 $ 78.3