Quarterly Financial Data (Unaudited) - Schedule of Quarterly Financial Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 3,342.3	$ 2,362.0	$ 1,215.9	$ 703.0	$ 830.7	$ 662.5	$ 581.0	$ 282.4	$ 7,623.2	$ 2,356.6	$ 702.3
Operating expenses
Cost of transportation and services	1,786.0	1,237.3	707.3	440.8	531.3	487.4	459.1	224.0	4,171.4	1,701.8	578.7
Direct operating expense	1,099.5	798.0	318.3	151.2	171.0	71.0	27.2	4.0	2,367.0	273.2	6.4
Sales, general and administrative expense	494.8	282.4	220.4	115.8	122.4	117.7	106.6	75.8	1,113.4	422.5	169.5
Total operating expenses	3,380.3	2,317.7	1,246.0	707.8	824.7	676.1	592.9	303.8	7,651.8	2,397.5	754.6
Operating loss	(38.0)	44.3	(30.1)	(4.8)	6.0	(13.6)	(11.9)	(21.4)	(28.6)	(40.9)	(52.3)
Other expense (income)	(0.8)	1.6	2.1	0.2	(0.3)	0.3	0.3	0.1	3.1	0.4	0.5
Foreign currency loss (gain)	(0.4)	14.5	19.8	0.2	0.4	0.0	0.0	0.0	34.1	0.4	0.0
Interest expense	95.9	61.4	36.3	23.1	16.7	17.8	3.4	10.1	216.7	48.0	18.2
Loss before income tax benefit	(132.7)	(33.2)	(88.3)	(28.3)	(10.8)	(31.7)	(15.6)	(31.6)	(282.5)	(89.7)	(71.0)
Income tax benefit	(69.6)	1.8	(9.5)	(13.6)	(0.9)	(20.1)	(1.8)	(3.3)	(90.9)	(26.1)	(22.5)
Net loss attributable to the Company	(63.1)	(35.0)	(78.8)	(14.7)	(9.9)	(11.6)	(13.8)	(28.3)	(191.1)	(63.6)	(48.5)
Preferred stock beneficial conversion charge	0.0	(52.0)	0.0	0.0	(40.9)	0.0	0.0	0.0	(52.0)	(40.9)	0.0
Cumulative preferred dividends	(0.7)	(0.7)	(0.7)	(0.7)	(0.7)	(0.7)	(0.7)	(0.8)	(2.8)	(2.9)	(3.0)
Net loss attributable to noncontrolling interests	1.0	(4.9)	4.4	0.0					0.5	0.0	0.0
Net loss attributable to common shareholders	$ (62.8)	$ (92.6)	$ (75.1)	$ (15.4)	$ (51.5)	$ (12.3)	$ (14.5)	$ (29.1)	$ (245.9)	$ (107.4)	$ (51.5)
Basic loss per share (in usd per share)	$ (0.58)	$ (0.94)	$ (0.89)	$ (0.20)	$ (0.77)	$ (0.23)	$ (0.28)	$ (0.70)	$ (2.65)	$ (2.00)	$ (2.26)
Diluted loss per share (in usd per share)	$ (0.58)	$ (0.94)	$ (0.89)	$ (0.20)	$ (0.77)	$ (0.23)	$ (0.28)	$ (0.70)	$ (2.65)	$ (2.00)	$ (2.26)