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Segment Reporting - Selected Financial Data for Each of Operating Segments (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Segment Reporting Information [Line Items]        
Revenue $ 3,887.1 $ 3,713.8 $ 11,186.9 $ 10,942.8
Operating income (loss) 186.8 168.8 485.4 401.5
Depreciation and amortization 167.3 161.8 489.1 485.4
Operating Segments | Transportation        
Segment Reporting Information [Line Items]        
Revenue 2,469.8 2,409.1 7,152.2 7,125.4
Operating income (loss) 145.2 125.4 406.0 354.0
Depreciation and amortization 111.7 114.8 329.3 341.9
Operating Segments | Logistics        
Segment Reporting Information [Line Items]        
Revenue 1,458.8 1,347.0 4,154.1 3,939.7
Operating income (loss) 77.4 75.3 188.9 158.3
Depreciation and amortization 54.9 46.5 155.1 142.2
Corporate        
Segment Reporting Information [Line Items]        
Revenue 0.0 0.0 0.0 0.0
Operating income (loss) (35.8) (31.9) (109.5) (110.8)
Depreciation and amortization 0.7 0.5 4.7 1.3
Eliminations        
Segment Reporting Information [Line Items]        
Revenue (41.5) (42.3) (119.4) (122.3)
Operating income (loss) 0.0 0.0 0.0 0.0
Depreciation and amortization $ 0.0 $ 0.0 $ 0.0 $ 0.0