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Balance Sheet Details (Tables) | 12 Months Ended
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Dec. 31, 2019
Condensed Financial Information Disclosure [Abstract] |
Schedule of Short-term Marketable Securities | Short-term marketable securities, consisting of equity securities and debt securities, were as follows as of the dates indicated:
| December 31, 2019
(In millions) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Market Value
Debt securities, available for sale: |  |  |  |  |  |  |
U.S. government agencies | $ | 675.6 |  |  | $ | 0.4 |  |  | $ | — |  |  | $ | 676.0 |
Commercial paper | 248.1 |  |  | 0.1 |  |  | — |  |  | 248.2 |
Corporate debt | 163.0 |  |  | — |  |  | (0.1 | ) |  | 162.9 |
Total debt securities, available for sale | $ | 1,086.7 |  |  | $ | 0.5 |  |  | $ | (0.1 | ) |  | $ | 1,087.1 |
| December 31, 2018
(In millions) | 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 |
Schedule of Reconciliation of Net Gain (Loss) Recognized on Equity Securities | The following table reconciles the net gain recognized on equity securities during the twelve months ended December 31, 2019, 2018 and 2017 to the unrealized gain recognized during those periods on equity securities still held at the reporting dates.
| Twelve Months Ended December 31,
(In millions) | 2019 |  | 2018 |  | 2017
Net gains and losses recognized during the period on equity securities | $ | (4.2 | ) |  | $ | 80.1 |  |  | $ | — |
Less: Net gains and losses recognized during the period on equity securities sold during the period | 4.2 |  |  | (44.1 | ) |  | — |
Unrealized gains recognized during the reporting period on equity securities still held at the reporting date | $ | — |  |  | $ | 36.0 |  |  | $ | — |
Schedule of Accounts Receivable |
| December 31,
(In millions) | 2019 |  | 2018
Accounts receivable | $ | 292.1 |  |  | $ | 233.9 |
Less allowance for doubtful accounts | (5.8 | ) |  | (7.2 | )
Total accounts receivable, net | $ | 286.3 |  |  | $ | 226.7 |
Schedule of Inventory |
| December 31,
(In millions) | 2019 |  | 2018
Raw materials | $ | 64.9 |  |  | $ | 30.8 |
Work-in-process | 11.1 |  |  | 11.2 |
Finished goods | 43.8 |  |  | 28.7 |
Total inventory | $ | 119.8 |  |  | $ | 70.7 |
Schedule of Property and Equipment |
| December 31,
(In millions) | 2019 |  | 2018
Building and land | $ | 15.5 |  |  | $ | 6.0 |
Furniture and fixtures | 12.8 |  |  | 9.0 |
Computer software and hardware | 32.7 |  |  | 29.2 |
Machinery and equipment | 130.2 |  |  | 80.7 |
Leasehold improvements | 102.5 |  |  | 80.7 |
Construction in progress | 132.6 |  |  | 57.3 |
Total cost | 426.3 |  |  | 262.9 |
Less accumulated depreciation and amortization | (105.0 | ) |  | (79.8 | )
Total property and equipment, net | $ | 321.3 |  |  | $ | 183.1 |
Schedule of Accounts Payable and Accrued Liabilities |
| December 31,
(In millions) | 2019 |  | 2018
Accounts payable trade | $ | 102.3 |  |  | $ | 75.5 |
Accrued tax, audit, and legal fees | 14.0 |  |  | 11.7 |
Accrued rebates | 93.3 |  |  | 36.1 |
Accrued warranty | 7.4 |  |  | 6.8 |
Other accrued liabilities | 39.4 |  |  | 17.0 |
Total accounts payable and accrued liabilities | $ | 256.4 |  |  | $ | 147.1 |
Schedule of Accrued Warranty | Reconciliations of our accrued warranty costs for the twelve months ended December 31, 2019 and 2018 were as follows:
| Twelve Months Ended December 31,
(In millions) | 2019 |  | 2018
Beginning balance | $ | 6.8 |  |  | $ | 8.8 |
Charges to costs and expenses | 32.7 |  |  | 17.4 |
Costs incurred | (32.1 | ) |  | (19.4 | )
Ending balance | $ | 7.4 |  |  | $ | 6.8 |
Schedule of Other Long-Term Liabilities |
| December 31,
(In millions) | 2019 |  | 2018
Finance lease obligations | $ | 14.4 |  |  | $ | 7.3 |
Deferred rent | — |  |  | 9.4 |
Other liabilities | 5.7 |  |  | 3.3 |
Total other liabilities | $ | 20.1 |  |  | $ | 20.0 |

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