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Acquisitions - Atlantic Central Logistics - Additional Information (Details) - USD ($)
$ in Millions
Jul. 28, 2014
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Business Acquisition [Line Items]        
Goodwill   $ 3,445.0 $ 929.3 $ 918.5
Atlantic Central Logistics        
Business Acquisition [Line Items]        
Consideration $ 36.2      
Goodwill 25.1      
Intangible assets acquired $ 12.5