XML 46 R21.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Debt Securities (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Amortized cost, gross unrealized gain (loss) positions and estimated fair value for available-for-sale debt securities | The following table summarizes the amortized cost, unrealized gain and loss recognized in accumulated other comprehensive income (loss) and fair value of debt securities available-for-sale at December 31, 2021, aggregated by major security type and contractual maturity:
|  |  | December 31, 2021 |  | December 31, 2020
(in millions) | Contractual Maturity |  | Amortized Cost |  | Unrealized Gain |  | Unrealized Loss |  | Fair Value |  | Amortized Cost |  | Unrealized Gain |  | Unrealized Loss |  | Fair Value
Commercial paper | 0 to 1 years |  | $ | 204.8 |  |  | $ | — |  |  | $ | — |  |  | $ | 204.8 |  |  | $ | 82.2 |  |  | $ | — |  |  | $ | — |  |  | $ | 82.2 |
Corporate debt securities | 0 to 1 years |  | 128.2 |  |  | — |  |  | (0.1) |  |  | 128.1 |  |  | 299.3 |  |  | 1.4 |  |  | — |  |  | 300.7 |
Securities of government-sponsored entities | 0 to 1 years |  | 37.6 |  |  | — |  |  | — |  |  | 37.6 |  |  | 230.9 |  |  | 0.1 |  |  | — |  |  | 231.0 |
|  |  | $ | 370.6 |  |  | $ | — |  |  | $ | (0.1) |  |  | $ | 370.5 |  |  | $ | 612.4 |  |  | $ | 1.5 |  |  | $ | — |  |  | $ | 613.9 |
Corporate debt securities | 1 to 3 years |  | $ | 358.9 |  |  | $ | — |  |  | $ | (1.5) |  |  | $ | 357.4 |  |  | $ | 144.8 |  |  | $ | 0.4 |  |  | $ | — |  |  | $ | 145.2 |
Securities of government-sponsored entities | 1 to 3 years |  | 204.3 |  |  | — |  |  | (1.0) |  |  | 203.3 |  |  | 81.9 |  |  | 0.1 |  |  | (0.1) |  |  | 81.9 |
|  |  | $ | 563.2 |  |  | $ | — |  |  | $ | (2.5) |  |  | $ | 560.7 |  |  | $ | 226.7 |  |  | $ | 0.5 |  |  | $ | (0.1) |  |  | $ | 227.1 |
Gross unrealized losses and fair value available-for-sale investments in unrealized loss position | The following table summarizes debt securities available-for-sale in an unrealized loss position for less than 12 months, aggregated by major security type. There were no debt securities available-for-sale in an unrealized loss position for longer than 12 months as of December 31, 2021 or 2020.
| December 31, 2021 |  |  |  |  |  |  |  |  | December 31, 2020
(in millions) | Fair Value |  | Unrealized Loss |  |  |  |  |  |  |  |  | Fair Value |  | Unrealized Loss
Corporate Debt Securities | $ | 428.6 |  |  | $ | (1.6) |  |  |  |  |  |  |  |  |  | $ | — |  |  | $ | — |
Securities of government-sponsored entities | 230.5 |  |  | (1.0) |  |  |  |  |  |  |  |  |  | 95.0 |  |  | (0.1) |
| $ | 659.1 |  |  | $ | (2.6) |  |  |  |  |  |  |  |  |  | $ | 95.0 |  |  | $ | (0.1) |

X
- Definition Tabular disclosure of fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27290-111563 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValueTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration