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Balance Sheet Details (Tables) | 6 Months Ended
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Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Schedule of Short-term Marketable Securities | Short-term marketable securities, consisting of debt securities, were as follows as of the dates indicated:
| June 30, 2021
(In millions) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Market Value
Debt securities, available for sale: |  |  |  |  |  |  |
U.S. government agencies | $ | 1,057.3 |  |  | $ | 0.1 |  |  | $ | (0.1) |  |  | $ | 1,057.3 |
Commercial paper | 261.8 |  |  | — |  |  | — |  |  | 261.8 |
Corporate debt | 107.1 |  |  | — |  |  | (0.1) |  |  | 107.0 |
Total debt securities, available for sale | $ | 1,426.2 |  |  | $ | 0.1 |  |  | $ | (0.2) |  |  | $ | 1,426.1 |
| December 31, 2020
(In millions) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Market Value
Debt securities, available for sale: |  |  |  |  |  |  |
U.S. government agencies | $ | 1,570.4 |  |  | $ | 0.1 |  |  | $ | (0.1) |  |  | $ | 1,570.4 |
Commercial paper | 258.7 |  |  | 0.1 |  |  | — |  |  | 258.8 |
Corporate debt | 60.9 |  |  | — |  |  | — |  |  | 60.9 |
Total debt securities, available for sale | $ | 1,890.0 |  |  | $ | 0.2 |  |  | $ | (0.1) |  |  | $ | 1,890.1 |
Schedule of Inventory |
(In millions) | June 30, 2021 |  | December 31, 2020
Raw materials | $ | 104.6 |  |  | $ | 69.9 |
Work-in-process | 13.6 |  |  | 14.2 |
Finished goods | 201.1 |  |  | 150.6 |
Total inventory | $ | 319.3 |  |  | $ | 234.7 |
Schedule of Property and Equipment |
(In millions) | June 30, 2021 |  | December 31, 2020
Land (1) | $ | 15.6 |  |  | $ | 15.6 |
Building (1) | 49.1 |  |  | 49.2 |
Furniture and fixtures | 21.9 |  |  | 15.3 |
Computer software and hardware | 39.3 |  |  | 35.7 |
Machinery and equipment | 236.4 |  |  | 198.9 |
Leasehold improvements | 225.0 |  |  | 135.8 |
Construction in progress | 275.5 |  |  | 219.0 |
Total cost | 862.8 |  |  | 669.5 |
Less accumulated depreciation and amortization | (186.8) |  |  | (154.2) |
Total property and equipment, net | $ | 676.0 |  |  | $ | 515.3 |
(1) Represents finance lease right-of-use assets.
Schedule of Accounts Payable and Accrued Liabilities |
(In millions) | June 30, 2021 |  | December 31, 2020
Accounts payable trade | $ | 165.9 |  |  | $ | 163.3 |
Accrued tax, audit, and legal fees | 17.9 |  |  | 15.3 |
Accrued rebates | 237.4 |  |  | 247.0 |
Accrued warranty | 11.2 |  |  | 11.7 |
Other accrued liabilities | 49.6 |  |  | 43.8 |
Total accounts payable and accrued liabilities | $ | 482.0 |  |  | $ | 481.1 |
Schedule of Accrued Payroll and Related Expenses |
(In millions) | June 30, 2021 |  | December 31, 2020
Accrued wages, bonus and taxes | $ | 64.6 |  |  | $ | 87.7 |
Other accrued employee benefits | 33.5 |  |  | 26.6 |
Total accrued payroll and related expenses | $ | 98.1 |  |  | $ | 114.3 |
Schedule of Other Long-Term Liabilities |
(In millions) | June 30, 2021 |  | December 31, 2020
Finance lease obligations | $ | 57.4 |  |  | $ | 54.0 |
Contractual obligations | 12.6 |  |  | 12.6 |
Other liabilities | 17.7 |  |  | 14.3 |
Total other long-term liabilities | $ | 87.7 |  |  | $ | 80.9 |

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