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Balance Sheet Details (Tables) | 3 Months Ended
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Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Short Term Marketable Securities, Available for Sale | Short-Term Marketable Securities Short-term marketable securities, consisting of equity securities and debt securities, were as follows as of the dates indicated. We sold the equity investment in Tandem Diabetes Care, Inc. that we held as of December 31, 2018 during the first quarter of 2019.
| March 31, 2019
(In millions) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Market Value
Debt securities, available for sale: |  |  |  |  |  |  |
U.S. government agencies | $ | 54.8 |  |  | $ | — |  |  | $ | — |  |  | $ | 54.8 |
Commercial paper | 3.0 |  |  | — |  |  | — |  |  | 3.0 |
Corporate debt | 15.1 |  |  | — |  |  | — |  |  | 15.1 |
Total debt securities, available for sale | 72.9 |  |  | — |  |  | — |  |  | 72.9 |
Total marketable securities | $ | 72.9 |  |  | $ | — |  |  | $ | — |  |  | $ | 72.9 |
| December 31, 2018
(In millions) | Cost or Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Market Value
Equity investment in Tandem Diabetes Care, Inc. | $ | 2.0 |  |  | $ | 36.0 |  |  | $ | — |  |  | $ | 38.0 |
Debt securities, available for sale: |  |  |  |  |  |  |
U.S. government agencies | 173.2 |  |  | — |  |  | (0.1 | ) |  | 173.1 |
Commercial paper | 36.2 |  |  | — |  |  | — |  |  | 36.2 |
Corporate debt | 1.3 |  |  | — |  |  | — |  |  | 1.3 |
Total debt securities, available for sale | 210.7 |  |  | — |  |  | (0.1 | ) |  | 210.6 |
Total marketable securities | $ | 212.7 |  |  | $ | 36.0 |  |  | $ | (0.1 | ) |  | $ | 248.6 |
Inventory | Inventory
(In millions) | March 31, 2019 |  | December 31, 2018
Raw materials | $ | 52.7 |  |  | $ | 30.8 |
Work-in-process | 10.0 |  |  | 11.2 |
Finished goods | 38.4 |  |  | 28.7 |
Total inventory | $ | 101.1 |  |  | $ | 70.7 |
Property, Plant and Equipment | Property and Equipment
(In millions) | March 31, 2019 |  | December 31, 2018
Building and land | $ | 15.3 |  |  | $ | 6.0 |
Furniture and fixtures | 9.1 |  |  | 9.0 |
Computer software and hardware | 31.6 |  |  | 29.2 |
Machinery and equipment | 82.5 |  |  | 80.7 |
Leasehold improvements | 83.2 |  |  | 80.7 |
Construction in progress | 88.1 |  |  | 57.3 |
Total cost | 309.8 |  |  | 262.9 |
Less accumulated depreciation and amortization | (88.4 | ) |  | (79.8 | )
Total property and equipment, net | $ | 221.4 |  |  | $ | 183.1 |
Accounts Payable and Accrued Liabilities | Accounts Payable and Accrued Liabilities
(In millions) | March 31, 2019 |  | December 31, 2018
Accounts payable trade | $ | 90.3 |  |  | $ | 75.5 |
Accrued tax, audit, and legal fees | 12.3 |  |  | 11.7 |
Accrued rebates | 40.9 |  |  | 36.1 |
Accrued warranty | 6.0 |  |  | 6.8 |
Restructuring reserve | 1.1 |  |  | — |
Other accrued liabilities | 18.5 |  |  | 17.0 |
Total accounts payable and accrued liabilities | $ | 169.1 |  |  | $ | 147.1 |
Other Liabilities | Other Long-Term Liabilities
(In millions) | March 31, 2019 |  | December 31, 2018
Finance lease liabilities | $ | 15.2 |  |  | $ | 7.3 |
Deferred rent | — |  |  | 9.4 |
Other liabilities | 2.9 |  |  | 3.3 |
Total other long-term liabilities | $ | 18.1 |  |  | $ | 20.0 |

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