CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities
Net income	$ 182.3	$ 24.2
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	41.3	43.1
Stock-based compensation	5.0
Amortization of debt discounts and issuance costs	1.5	1.9
(Gain) loss on disposal of assets, net	0.3	(0.8)
Loss on extinguishment of debt, net	10.1
Gain on insurance recoveries		(2.9)
Other non-cash items	1.1	(1.0)
Changes in operating assets and liabilities:
Accounts receivable	(54.8)	(100.0)
Accounts receivable from related parties	(19.4)	(17.7)
Inventories	(17.3)	(8.2)
Prepaid expenses and other assets	(0.8)	(0.1)
Accounts payable	25.0	48.3
Accrued expenses and other liabilities	(0.8)	4.7
Net cash provided by (used in) operating activities	173.5	(8.5)
Cash flows from investing activities
Capital expenditures	(66.3)	(19.8)
Proceeds from disposal of assets	0.6	1.8
Proceeds from insurance recoveries		4.2
Net cash used in investing activities	(65.7)	(13.8)
Cash flows from financing activities
Repayments of long-term debt	(499.3)
Net proceeds from issuance of common stock	303.0
Payments of revolving credit facility issuance costs	(2.4)
Net cash used in financing activities	(198.7)
Net decrease in cash, cash equivalents, and restricted cash	(90.9)	(22.3)
Cash, cash equivalents, and restricted cash at beginning of period	217.2	169.4
Cash, cash equivalents, and restricted cash at end of period	$ 126.3	$ 147.1