Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities
Net income	$ 12.3	$ 5.8
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	18.8	11.0
Non-cash interest	22.3	15.4
Stock-based compensation	13.7	14.1
Provision for credit losses	2.6	2.0
Other	0.0	(0.6)
Changes in operating assets and liabilities:
Accounts receivable	(13.8)	(7.0)
Inventories	(2.8)	(14.0)
Prepaid expenses and other assets	(14.0)	(1.5)
Accounts payable, accrued expenses and other current liabilities	(13.9)	(3.5)
Other liabilities	(2.4)	(1.3)
Net cash provided by operating activities	22.8	20.4
Cash flows from investing activities
Capital expenditures	(51.7)	(91.9)
Acquisition of intangible assets	(0.5)	(5.0)
Purchases of investments	(37.9)	(39.1)
Receipts from the maturity or sale of investments	170.7	104.2
Net cash provided by (used in) investing activities	80.6	(31.8)
Cash flows from financing activities
Proceeds from issuance of common stock, net of issuance costs	477.5	0.0
Proceeds from exercise of stock options and issuance of common stock under employee stock purchase plan	14.2	25.6
Payment of withholding taxes in connection with vesting of restricted stock units	(26.8)	(7.9)
Net cash provided by financing activities	464.9	17.7
Effect of exchange rate changes on cash	(2.9)	(0.3)
Net increase in cash, cash equivalents and restricted cash	565.4	6.0
Cash, cash equivalents and restricted cash at beginning of period	213.7	113.9
Cash, cash equivalents and restricted cash at end of period	779.1	119.9
Supplemental cash flow information:
Purchases of property and equipment included in accounts payable and accrued expenses	$ 4.5	$ 3.0