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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash flows from operating activities:    
Net income (loss) $ 43.4 $ (76.6)
Adjustments to reconcile net income (loss) to net cash from operating activities:    
Stock-based compensation expense 44.5 39.9
Charges associated with convertible senior notes 88.7 0.0
Depreciation 5.3 4.1
Accretion of discount on investments, net (7.1) (2.1)
Amortization of intangible assets 0.9 0.9
Changes in fair value of equity investments (1.6) (2.2)
Deferred income taxes (15.6) (31.6)
Other 3.4 (0.1)
Change in operating assets and liabilities:    
Accounts receivable (11.3) (41.7)
Inventory 1.1 1.8
Accounts payable and accrued liabilities (18.6) 6.7
Other assets and liabilities, net (2.8) (24.3)
Cash flows from operating activities 130.3 (125.2)
Cash flows from investing activities:    
Purchases of debt securities available-for-sale (320.1) (206.2)
Sales and maturities of debt securities available-for-sale 276.3 203.9
Purchases of equity investments 0.0 (31.3)
Capital expenditures (11.2) (8.5)
Cash flows from investing activities (55.0) (42.1)
Cash flows from financing activities:    
Issuances of common stock under benefit plans 69.9 8.2
Cash flows from financing activities 69.9 8.2
Change in cash, cash equivalents and restricted cash 145.2 (159.1)
Cash, cash equivalents and restricted cash at beginning of period 259.1 270.7
Cash, cash equivalents and restricted cash at end of period 404.3 111.6
Supplemental disclosures:    
Non-cash capital expenditures 1.1 0.6
Cash paid for income taxes $ 0.2 $ 0.2