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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Operating activities    
Net income $ 8.4 $ 52.6
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation and amortization 34.4 20.5
Share-based compensation 79.1 77.3
Non-cash interest expense 37.0 11.3
Unrealized (gain) loss on equity investment 0.0 (40.8)
Realized (gain) loss on equity investment 4.2 (44.2)
Other non-cash income and expenses 0.6 5.1
Changes in operating assets and liabilities:    
Accounts receivable, net (9.2) (36.2)
Inventory (49.7) (10.0)
Prepaid and other assets (2.6) (3.4)
Accounts payable and accrued liabilities 78.2 50.2
Accrued payroll and related expenses (1.2) 6.2
Deferred revenue and other liabilities (8.4) 0.9
Net cash provided by operating activities 170.8 89.5
Cash flows from investing activities:    
Purchases of marketable securities (1,556.8) (340.0)
Proceeds from sale and maturity of marketable securities 773.0 231.0
Purchases of other equity investments (1.2) (1.0)
Purchases of property and equipment (135.9) (49.4)
Acquisitions, net of cash acquired 0.0 (11.3)
Net cash used in investing activities (920.9) (170.7)
Cash flows from financing activities:    
Net proceeds from issuance of common stock 11.9 10.6
Payments on acquisition related contingent consideration liability (0.7) (1.8)
Other financing activities (0.4) 0.0
Net cash provided by financing activities 10.8 8.8
Effect of exchange rate changes on cash, cash equivalents and restricted cash (1.7) (1.4)
Decrease in cash, cash equivalents and restricted cash (741.0) (73.8)
Cash, cash equivalents and restricted cash, beginning of period 1,137.1 441.5
Cash, cash equivalents and restricted cash, end of period 396.1 367.7
Reconciliation of cash, cash equivalents and restricted cash, end of period:    
Total cash, cash equivalents and restricted cash 1,137.1 441.5
Supplemental disclosure of non-cash investing and financing transactions:    
Acquisition of property and equipment included in accounts payable and accrued liabilities 22.3 $ 3.0
Right-of-use assets obtained in exchange for lease liabilities $ 57.2