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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Operating activities    
Net income $ 48.6 $ 97.3
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation and amortization 41.6 36.8
Share-based compensation 35.2 29.1
Non-cash interest expense 1.5 1.6
Realized (gain) loss on equity investment 0.0 (0.2)
Deferred income taxes (9.3) 0.1
Other non-cash income and expenses (13.7) 3.8
Changes in operating assets and liabilities:    
Accounts receivable, net 76.6 (30.1)
Inventory (59.6) 15.6
Prepaid and other assets (13.4) (97.9)
Operating lease right-of-use assets and liabilities, net (0.7) (0.9)
Accounts payable and accrued liabilities 86.7 53.5
Accrued payroll and related expenses (39.3) (40.5)
Deferred revenue and other liabilities 1.2 2.8
Net cash provided by operating activities 155.4 71.0
Investing activities    
Purchases of marketable securities (809.6) (546.5)
Proceeds from sale and maturity of marketable securities 697.6 241.8
Purchases of property and equipment (74.7) (101.6)
Acquisitions, net of cash acquired 0.0 (3.2)
Other investing activities 0.0 (2.3)
Net cash used in investing activities (186.7) (411.8)
Financing activities    
Net proceeds from issuance of common stock 12.3 10.1
Other financing activities (1.1) (4.8)
Net cash provided by financing activities 11.2 5.3
Effect of exchange rate changes on cash, cash equivalents and restricted cash 1.1 (1.0)
Decrease in cash, cash equivalents and restricted cash (19.0) (336.5)
Cash, cash equivalents and restricted cash, beginning of period 643.3 1,053.6
Cash, cash equivalents and restricted cash, end of period 624.3 717.1
Reconciliation of cash, cash equivalents and restricted cash, end of period:    
Cash and cash equivalents 623.2 716.0
Restricted cash 1.1 1.1
Total cash, cash equivalents and restricted cash 624.3 717.1
Supplemental disclosure of non-cash investing and financing transactions:    
Shares issued for conversions of 2023 Notes 0.0 35.9
Shares received under note hedge upon conversion of 2023 Notes 0.0 (33.5)
Acquisition of property and equipment included in accounts payable and accrued liabilities 55.8 26.6
Right-of-use assets obtained in exchange for operating lease liabilities 1.9 (1.3)
Right-of-use assets obtained in exchange for finance lease liabilities $ 1.0 $ 5.2