Segment Reporting - Selected Financial Data for Each of Operating Segments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Revenue	$ 3,545.7	$ 703.0
Operating income (loss)	62.4	(4.8)
Depreciation and amortization	162.1	33.8
Interest expense	93.1	23.1
Income tax benefit	(15.7)	(13.6)
Goodwill	4,787.0	967.8	$ 4,610.6
Operating Segments | Transportation
Segment Reporting Information [Line Items]
Revenue	2,297.4	562.2
Operating income (loss)	75.4	3.6
Depreciation and amortization	114.6	19.7
Interest expense	0.0	0.0
Income tax benefit	0.0	0.0
Goodwill	2,629.6	614.7	2,504.7
Operating Segments | Logistics
Segment Reporting Information [Line Items]
Revenue	1,260.7	140.8
Operating income (loss)	31.9	6.4
Depreciation and amortization	47.1	13.7
Interest expense	0.0	0.0
Income tax benefit	0.0	0.0
Goodwill	2,157.4	353.1	$ 2,105.9
Corporate
Segment Reporting Information [Line Items]
Revenue	0.0	0.0
Operating income (loss)	(44.9)	(14.8)
Depreciation and amortization	0.4	0.4
Interest expense	93.1	23.1
Income tax benefit	(15.7)	(13.6)
Goodwill	0.0	0.0
Eliminations
Segment Reporting Information [Line Items]
Revenue	(12.4)	0.0
Operating income (loss)	0.0	0.0
Depreciation and amortization	0.0	0.0
Interest expense	0.0	0.0
Income tax benefit	0.0	0.0
Goodwill	$ 0.0	$ 0.0