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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Operating activities    
Net income (loss) $ 6.0 $ (38.8)
Adjustments to reconcile net loss to cash used in operating activities:    
Depreciation and amortization 12.7 7.6
Share-based compensation 50.2 55.9
Non-cash interest expense 7.5 2.1
Unrealized income on equity investment (50.1) 0.0
Deferred tax 0.0 (17.1)
Other non-cash income and expenses 4.7 6.1
Changes in operating assets and liabilities:    
Accounts receivable, net (28.1) 0.5
Inventory (1.0) 2.8
Prepaid and other assets (5.0) (6.2)
Accounts payable and accrued liabilities 32.9 1.8
Accrued payroll and related expenses (2.0) (2.1)
Deferred revenue 3.6 0.5
Deferred rent and other liabilities 1.3 1.5
Net cash provided by operating activities 32.7 14.6
Investing activities    
Purchase of available-for-sale marketable securities (224.1) (91.4)
Proceeds from the maturity of available-for-sale marketable securities 75.4 19.6
Purchase of other equity investments 1.0 0.0
Purchase of property and equipment (25.6) (34.9)
Net cash used in investing activities (175.3) (106.7)
Financing activities    
Net proceeds from issuance of common stock 5.2 5.7
Payments on acquisition related contingent consideration liability (1.8) 0.0
Proceeds from issuance of convertible debt, net of issuance costs 0.0 389.0
Proceeds from short-term borrowings 0.0 75.0
Repayment of short-term borrowings 0.0 (75.0)
Net cash provided by financing activities 3.4 394.7
Effect of exchange rate changes on cash, cash equivalents and restricted cash (1.8) (1.2)
Increase (decrease) in cash, cash equivalents and restricted cash (141.0) 301.4
Cash, cash equivalents and restricted cash, beginning of period 441.5 94.5
Cash, cash equivalents and restricted cash, end of period 300.5 395.9
Cash 300.2 395.9
Restricted cash 0.3 0.0
Supplemental disclosure of non-cash investing and financing transactions:    
Acquisition of property and equipment included in accounts payable and accrued liabilities $ 6.3 $ 4.9