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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Cash Flows from Operating Activities:    
Net income (loss) $ 117.0 $ (50.8)
Reconciliation of net income (loss) to net cash provided by (used in) operating activities:    
Share-based compensation expense 52.3 33.7
Depreciation 4.2 3.4
Amortization of debt discount 10.0 9.3
Amortization of debt issuance costs 0.7 0.7
Change in fair value of equity security investments 5.2 (22.7)
Other 0.7 (0.6)
Change in operating assets and liabilities:    
Accounts receivable (21.8) (39.1)
Inventory (4.7) (1.2)
Accounts payable and accrued liabilities (5.1) 7.7
Other assets and liabilities, net (1.4) 11.3
Net cash provided by (used in) operating activities 157.1 (48.3)
Cash Flows from Investing Activities:    
Purchases of debt securities available-for-sale (288.6) (235.9)
Sales and maturities of debt securities available-for-sale 421.2 339.7
Purchases of equity securities 0.0 (54.7)
Purchases of property and equipment (6.0) (8.4)
Net cash provided by investing activities 126.6 40.7
Cash Flows from Financing Activities:    
Issuance of common stock 19.1 6.9
Net cash provided by financing activities 19.1 6.9
Change in cash and cash equivalents and restricted cash 302.8 (0.7)
Cash and cash equivalents and restricted cash at beginning of period 115.5 147.2
Cash and cash equivalents and restricted cash at end of period 418.3 146.5
Supplemental Disclosure:    
Non-cash capital expenditures 0.9 0.9
Cash paid for interest 5.8 5.8
Cash paid for income taxes $ 0.0 $ 0.4