CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Cash flows from operating activities
Net Loss	$ (11.7)	$ (55.0)
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	21.4	22.4
Stock-based compensation	3.1	3.0
Amortization of debt discounts and issuance costs	0.4	0.5
Impairment of assets		2.8
Gain on disposal of assets, net	(0.1)	0.3
Gain on extinguishment of debt, net	(2.0)	(0.5)
Non-cash provision for supply commitment charges	3.2	56.6
Cash paid to settle supply commitment charges	(11.2)
Inventory write-down		1.4
Other non-cash items	1.0	(0.8)
Changes in operating assets and liabilities:
Accounts receivable	(2.4)	7.7
Accounts receivable from related parties	(0.7)
Inventories	1.8	(1.7)
Prepaid expenses and other assets	(8.1)	0.3
Accounts payable	16.2	(11.3)
Accrued expenses and other liabilities	2.3	8.2
Net cash provided by operating activities	13.2	33.9
Cash flows from investing activities
Capital expenditures	(16.4)	(11.7)
Proceeds from disposal of assets	0.1	0.1
Net cash used in investing activities	(16.3)	(11.6)
Cash flows from financing activities
Repayments of long-term debt	(20.6)	(26.3)
Taxes paid related to net share settlement of equity awards	(0.1)	(1.7)
Net cash used in financing activities	(20.7)	(28.0)
Net decrease in cash and cash equivalents	(23.8)	(5.7)
Cash and cash equivalents at beginning of period	223.0	177.8	$ 177.8
Cash and cash equivalents at end of period	199.2	172.1	$ 223.0
Supplemental cash flow information:
Interest paid	1.4	2.3
Noncash investing and financing activities:
Capital expenditures included in accounts payable	$ 2.0	$ 4.1