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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Operating activities    
Net income (loss) $ (37.4) $ 6.0
Adjustments to reconcile net income (loss) to cash provided by operating activities:    
Depreciation and amortization 21.5 12.7
Share-based compensation 54.7 50.2
Non-cash interest expense 24.5 7.5
(Income) loss from equity investments 4.2 (50.1)
Other non-cash income and expenses (1.9) 4.7
Changes in operating assets and liabilities:    
Accounts receivable, net 9.2 (28.1)
Inventory (47.2) (1.0)
Prepaid and other assets (3.4) (5.0)
Accounts payable and accrued liabilities 53.9 32.9
Accrued payroll and related expenses 1.6 (2.0)
Deferred revenue and other liabilities (3.4) 4.9
Net cash provided by operating activities 76.3 32.7
Cash flows from investing activities:    
Purchase of marketable securities (934.5) (224.1)
Proceeds from sale and maturity of marketable securities 513.8 75.4
Purchase of other equity investments (1.2) (1.0)
Purchase of property and equipment (86.2) (25.6)
Net cash used in investing activities (508.1) (175.3)
Cash flows from financing activities:    
Net proceeds from issuance of common stock 5.1 5.2
Other financing activities (0.3) (1.8)
Net cash provided by financing activities 4.8 3.4
Effect of exchange rate changes on cash, cash equivalents and restricted cash (0.3) (1.8)
Decrease in cash, cash equivalents and restricted cash (427.3) (141.0)
Cash, cash equivalents and restricted cash, beginning of period 1,137.1 441.5
Cash, cash equivalents and restricted cash, end of period 709.8 300.5
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 7.1 6.3
Right-of-use assets obtained in exchange for lease liabilities $ 55.8 $ 0.0