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Condensed Consolidated Balance Sheets - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Current assets:    
Cash and cash equivalents $ 368.0 $ 187.1
Debt securities available-for-sale, at fair value (amortized cost $516.3 million at June 30, 2021 and $612.4 million at December 31, 2020) 516.9 613.9
Accounts receivable 158.5 157.1
Inventories 28.3 28.0
Other current assets 38.4 30.1
Total current assets 1,110.1 1,016.2
Deferred tax assets 316.1 319.4
Debt securities available-for-sale, at fair value (amortized cost $337.9 million at June 30, 2021 and $226.7 million at December 31, 2020) 337.8 227.1
Right-of-use assets 100.3 82.8
Equity securities 38.9 38.2
Property and equipment, net 50.0 44.6
Other assets 3.2 6.4
Total assets 1,956.4 1,734.7
Current liabilities:    
Accounts payable and accrued liabilities 190.9 168.7
Other current liabilities 22.0 17.8
Total current liabilities 212.9 186.5
Convertible senior notes 326.3 317.9
Operating lease liabilities 109.0 94.4
Other long-term liabilities 29.0 9.7
Total liabilities 677.2 608.5
Stockholders’ equity:    
Preferred stock, $0.001 par value; 5.0 shares authorized; no shares issued and outstanding at June 30, 2021 and December 31, 2020 0.0 0.0
Common stock, $0.001 par value; 220.0 shares authorized; issued and outstanding shares were 94.6 at June 30, 2021 and 93.5 at December 31, 2020 0.1 0.1
Additional paid-in capital 1,929.4 1,849.7
Accumulated other comprehensive income 0.7 1.8
Accumulated deficit (651.0) (725.4)
Total stockholders’ equity 1,279.2 1,126.2
Total liabilities and stockholders’ equity $ 1,956.4 $ 1,734.7