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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Operating activities    
Net income $ 138.4 $ 8.4
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation and amortization 46.7 34.4
Share-based compensation 85.3 79.1
Loss on extinguishment of debt 5.9 0.0
Non-cash interest expense 52.0 37.0
Realized loss on equity investment 1.4 4.2
Other non-cash income and expenses 4.1 0.6
Changes in operating assets and liabilities:    
Accounts receivable, net (83.8) (9.2)
Inventory (80.9) (49.7)
Prepaid and other assets (11.8) (0.5)
Operating lease right-of-use assets and liabilities, net (1.3) (2.1)
Accounts payable and accrued liabilities 126.6 78.2
Accrued payroll and related expenses 4.3 (1.2)
Deferred revenue and other liabilities 16.7 (8.4)
Net cash provided by operating activities 303.6 170.8
Cash flows from investing activities:    
Purchases of marketable securities (2,143.1) (1,556.8)
Proceeds from sale and maturity of marketable securities 1,298.5 773.0
Purchases of property and equipment (138.8) (135.9)
Other investing activities (10.6) (1.2)
Net cash used in investing activities (994.0) (920.9)
Cash flows from financing activities:    
Proceeds from issuance of convertible notes, net of issuance costs 1,188.8 0.0
Repurchase of convertible notes (282.6) 0.0
Net proceeds from issuance of common stock 15.3 11.9
Other financing activities (4.5) (1.1)
Net cash provided by financing activities 917.0 10.8
Effect of exchange rate changes on cash, cash equivalents and restricted cash 0.8 (1.7)
Increase (decrease) in cash, cash equivalents and restricted cash 227.4 (741.0)
Cash, cash equivalents and restricted cash, beginning of period 446.4 1,137.1
Cash, cash equivalents and restricted cash, end of period 673.8 396.1
Reconciliation of cash, cash equivalents and restricted cash, end of period:    
Total cash, cash equivalents and restricted cash 673.8 396.1
Supplemental disclosure of non-cash investing and financing transactions:    
Common stock issued for repurchase and conversions of senior convertible notes 1,350.9 0.0
Acquisition of property and equipment included in accounts payable and accrued liabilities 27.8 22.3
Right-of-use assets obtained in exchange for operating lease liabilities 34.8 57.2
Right-of-use assets obtained in exchange for finance lease liabilities $ 33.4 $ 0.0