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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash Flows from Operating Activities:    
Net income $ 32.1 $ 37.4
Reconciliation of net income to net cash provided by operating activities:    
Share-based compensation expense 32.9 22.8
Depreciation 2.5 2.1
Amortization of debt discount 3.9 5.0
Amortization of debt issuance costs 0.3 0.3
Change in fair value of equity security investments (0.7) 16.5
Deferred income taxes (6.2) 0.0
Other 2.6 0.4
Change in operating assets and liabilities:    
Accounts receivable 9.3 (22.1)
Inventories (2.1) (3.9)
Accounts payable and accrued liabilities 11.0 (16.2)
Other assets and liabilities, net 1.7 (6.8)
Net cash provided by operating activities 87.3 35.5
Cash Flows from Investing Activities:    
Purchases of debt securities available-for-sale (93.7) (172.0)
Sales and maturities of debt securities available-for-sale 161.3 206.5
Purchases of property and equipment (4.5) (1.3)
Net cash provided by investing activities 63.1 33.2
Cash Flows from Financing Activities:    
Issuances of common stock under benefit plans 15.2 6.0
Partial repurchase of convertible senior notes (0.1) 0.0
Net cash provided by financing activities 15.1 6.0
Change in cash, cash equivalents and restricted cash 165.5 74.7
Cash, cash equivalents and restricted cash at beginning of period 190.3 115.5
Cash, cash equivalents and restricted cash at end of period 355.8 190.2
Supplemental Disclosure:    
Non-cash capital expenditures 0.1 0.8
Right-of-use assets acquired through operating leases $ 16.0 $ 0.0