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Acquisitions - UX Specialized Logistics - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Feb. 09, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]        
Acquisition of businesses, net of cash acquired   $ 3,887.0 $ 814.0 $ 458.8
Goodwill   $ 4,610.6 $ 929.3 $ 363.4
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