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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Cash flows from operating activities:    
Net (loss) income $ (3.0) $ 74.4
Adjustments to reconcile net (loss) income to net cash from operating activities:    
Stock-based compensation expense 86.5 61.5
Loss on extinguishment of convertible senior notes 70.0 0.0
Depreciation 7.2 5.1
Amortization of debt discount 0.0 7.9
Amortization of debt issuance costs 0.8 0.6
Change in fair value of equity security investments (12.5) (0.7)
Deferred income taxes (3.4) 3.3
Other 2.3 5.6
Change in operating assets and liabilities:    
Accounts receivable (93.5) (1.4)
Inventories 1.2 (0.3)
Accounts payable and accrued liabilities 44.2 29.0
Other assets and liabilities, net (2.2) 5.5
Cash flows from operating activities 97.6 190.5
Cash flows from investing activities:    
Purchases of debt securities available-for-sale (253.7) (383.1)
Sales and maturities of debt securities available-for-sale 277.6 364.2
Purchases of equity securities (7.7) 0.0
Purchases of property and equipment (16.4) (8.8)
Cash flows from investing activities (0.2) (27.7)
Cash flows from financing activities:    
Issuances of common stock under benefit plans 8.7 18.2
Repurchase of convertible senior notes (279.0) (0.1)
Cash flows from financing activities (270.3) 18.1
Change in cash, cash equivalents and restricted cash (172.9) 180.9
Cash, cash equivalents and restricted cash at beginning of period 344.0 190.3
Cash, cash equivalents and restricted cash at end of period 171.1 371.2
Supplemental disclosures:    
Non-cash capital expenditures 0.9 2.2
Right-of-use assets acquired through operating leases 0.0 21.6
Cash paid for interest 4.6 4.3
Cash paid for income taxes $ 3.1 $ 1.6