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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Operating activities    
Net income $ 289.9 $ 164.5
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation and amortization 104.6 85.3
Share-based compensation 83.7 74.9
Non-cash interest expense 3.7 3.6
Deferred income taxes (56.5) (51.5)
Other non-cash income and expenses (23.4) (29.4)
Changes in operating assets and liabilities:    
Accounts receivable, net 28.0 (37.1)
Inventory (18.4) (115.0)
Prepaid and other assets (45.4) (3.4)
Operating lease right-of-use assets and liabilities, net (3.6) (2.1)
Accounts payable and accrued liabilities 181.9 277.0
Accrued payroll and related expenses (55.2) (25.5)
Deferred revenue and other liabilities (0.7) 4.4
Net cash provided by operating activities 488.6 345.7
Investing activities    
Purchases of marketable securities (1,776.6) (2,149.9)
Proceeds from sale and maturity of marketable securities 1,788.6 1,557.0
Purchases of property and equipment (123.0) (133.7)
Other investing activities (3.1) (16.0)
Net cash used in investing activities (114.1) (742.6)
Financing activities    
Net proceeds from issuance of common stock 13.4 12.3
Purchases of treasury stock 0.0 (188.7)
Proceeds from issuance of senior convertible notes, net of issuance costs 0.0 1,230.6
Purchases of capped call transactions 0.0 (101.3)
Other financing activities (10.1) (2.2)
Net cash provided by financing activities 3.3 950.7
Effect of exchange rate changes on cash, cash equivalents and restricted cash (4.8) (1.1)
Increase in cash, cash equivalents and restricted cash 373.0 552.7
Cash, cash equivalents and restricted cash, beginning of period 567.5 643.3
Cash, cash equivalents and restricted cash, end of period 940.5 1,196.0
Reconciliation of cash, cash equivalents and restricted cash, end of period:    
Cash and cash equivalents 939.2 1,194.9
Restricted cash 1.3 1.1
Total cash, cash equivalents and restricted cash 940.5 1,196.0
Supplemental disclosure of non-cash investing and financing transactions:    
Acquisition of property and equipment included in accounts payable and accrued liabilities 90.7 53.4
Right-of-use assets obtained in exchange for operating lease liabilities 8.7 4.1
Right-of-use assets obtained in exchange for finance lease liabilities $ 9.8 $ 1.5