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Acquisitions - UX Specialized Logistics - Additional Information (Details) - USD ($)
$ in Millions
9 Months Ended
Feb. 09, 2015
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Business Acquisition [Line Items]        
Acquisition of businesses, net of cash acquired   $ 1,609.8 $ 813.7  
Business combination, consideration transferred, shares of stock   1.5 138.3  
Goodwill   $ 3,445.0 $ 918.5 $ 929.3
UX Specialized Logistics        
Business Acquisition [Line Items]        
Consideration $ 58.9      
Acquisition of businesses, net of cash acquired 58.1      
Business combination, consideration transferred, shares of stock 0.8      
Goodwill 28.9      
Intangible assets acquired $ 18.8