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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Statement of Cash Flows [Abstract]    
Cash and Cash Equivalents, at Carrying Value $ 367.4  
Operating activities    
Net income (loss) 52.6 $ (40.8)
Adjustments to reconcile net income (loss) to cash provided by operating activities:    
Depreciation and amortization 20.5 11.9
Share-based compensation 77.3 81.3
Non-cash interest expense 11.3 5.7
Unrealized income on equity investment (40.8) 0.0
Realized income on equity investment (44.1) 0.0
Deferred tax 0.0 (18.2)
Other non-cash income and expenses 5.0 3.2
Changes in operating assets and liabilities:    
Accounts receivable, net (36.2) (8.2)
Inventory (10.0) 2.2
Prepaid and other assets (3.4) (3.7)
Accounts payable and accrued liabilities 50.2 12.5
Accrued payroll and related expenses 6.2 1.6
Deferred revenue 0.3 1.4
Deferred rent and other liabilities 0.6 1.9
Net cash provided by operating activities 89.5 50.8
Investing activities    
Purchase of marketable securities (340.0) (141.9)
Proceeds from sale and maturity of marketable securities 231.0 47.0
Purchase of other equity investments (1.0) 0.0
Purchase of property and equipment (49.4) (48.4)
Acquisitions, net of cash acquired (11.3) 0.0
Net cash used in investing activities (170.7) (143.3)
Financing activities    
Net proceeds from issuance of common stock 10.6 10.0
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 8.8 399.0
Effect of exchange rate changes on cash, cash equivalents and restricted cash (1.4) 1.1
Increase (decrease) in cash, cash equivalents and restricted cash (73.8) 307.6
Cash, cash equivalents and restricted cash, beginning of period 441.5 94.5
Cash, cash equivalents and restricted cash, end of period 367.7 402.1
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 $ 3.0 $ 6.5