CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue
Revenue	$ 493.3	$ 344.9	$ 960.8	$ 558.4
Operating expenses
Costs of revenue (excluding depreciation of $18.5, $18.5, $36.9 and $37.3, respectively, included in depreciation and amortization below)	329.4	236.3	641.6	411.1
Selling, general and administrative	20.8	20.8	46.6	40.3
Depreciation and amortization	20.7	21.3	41.3	43.1
Impairments and other charges	4.0	1.2	6.0	1.3
(Gain) loss on disposal of assets, net	(0.2)	(0.4)	0.3	(0.8)
Gain on insurance recoveries		(0.3)		(2.9)
Total operating expenses	374.7	278.9	735.8	492.1
Operating income	118.6	66.0	225.0	66.3
Interest expense, net	(12.1)	(21.5)	(29.5)	(42.7)
Gain (Loss) on extinguishment of debt	(0.8)		(10.1)
Equity in net (loss) income of joint venture affiliate	(1.2)	0.2	(1.2)	1.1
Income before income taxes	104.5	44.7	184.2	24.7
Income tax expense	0.9	0.4	1.9	0.5
Net income	103.6	44.3	182.3	24.2
Net income (loss) attributable to common stockholders	$ 103.6	$ (10.5)	$ 605.5	$ (81.9)
Basic and diluted earnings (loss) per share attributable to common stockholders	$ 0.95	$ (0.20)	$ 6.12	$ (1.58)
Shares used in computing basic and diluted earnings (loss) per share	109.3	51.8	98.9	51.8
Oil and Gas Services
Revenue
Revenue	$ 456.7	$ 304.4	$ 881.8	$ 496.3
Oil and Gas Services | Related Party
Revenue
Revenue	$ 36.6	$ 40.5	$ 79.0	$ 62.1