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Acquisitions - UX Specialized Logistics - Additional Information (Details) - USD ($)
$ in Millions
6 Months Ended
Feb. 09, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Business Acquisition [Line Items]        
Acquisition of businesses, net of cash acquired   $ 0.0 $ 1,610.7  
Business combination, consideration transferred, shares of stock   0.0 $ 1.5  
Goodwill   $ 4,732.0   $ 4,610.6
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 38.1      
Intangible assets acquired $ 18.8