XML 89 R71.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 11, 2018 | Dec. 31, 2018 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 01, 2023 | Jun. 15, 2023 | Apr. 19, 2021 | Feb. 22, 2021 | Dec. 05, 2018
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Common Stock Aggregate Sale Price |  |  |  |  |  |  |  |  | $ 750.0 |
Proceeds from Issuance of Preferred Stock and Preference Stock |  |  | $ (393.9) | $ 0.0 | $ 0.0 |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  |  | $ 0.01 | $ 0.01 |  |  |  |  |  |
Net Process from Sale |  |  |  |  |  |  |  | $ 835.5 |  |
Equity Units Stock Purchase Contract Liability Payment |  |  |  | $ 66.8 |  |  |  |  |  |
Purchase Contract Liability |  |  | $ 0.0 | $ 65.0 | $ 129.4 |  |  | $ 168.8 |  |
Equity Units purchase contracts |  |  | 29,800,000 | 30,200,000 | 22,000,000.0 |  |  |  |  |
Excise and Sales Taxes |  |  | $ 3.6 |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding |  |  | 40,000 | 1,302,500 |  |  |  |  |  |
Series A Corporate Units |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share |  |  |  |  |  |  |  | $ 100 |  |
Corporate Units Contract Annual Rate |  |  |  |  |  |  |  | 7.75% |  |
Series A Preferred Stock |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage | 5.65% |  |  |  |  |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share |  |  | $ 1,000 |  |  |  | $ 1,000 |  |  |
Preferred Stock, Amount of Preferred Dividends in Arrears |  |  | $ 1.0 |  |  |  |  |  |  |
Preferred Stock, Per Share Amounts of Preferred Dividends in Arrears |  |  | $ 2.51 |  |  |  |  |  |  |
Preferred Stock, Liquidation Preference, Value |  |  | $ 400.0 | $ 400.0 | $ 400.0 |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  |  | $ 0.01 |  |  |  |  |  |  |
Preferred Stock Shares Redeemed |  |  | 400,000 |  |  |  |  |  |  |
Preferred Stock, Redemption Amount |  |  | $ 400.0 |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding | 400,000 |  | 0 |  |  |  |  |  |  |
Series B Preferred Stock |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  | 6.50% |  |  |  |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share |  |  | $ 25,000 |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Initial Margin |  | 3.632% |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Initial Margin Plus 1.000% |  | 1.00% |  |  |  |  |  |  |  |
Preferred Stock, Amount of Preferred Dividends in Arrears |  |  | $ 1.4 |  |  |  |  |  |  |
Preferred Stock, Per Share Amounts of Preferred Dividends in Arrears |  |  | $ 72.23 |  |  |  |  |  |  |
Preferred Stock Depositary Shares Issued |  |  |  |  |  |  |  |  |  | 20,000,000
Preferred Stock, Liquidation Preference, Value |  |  | $ 500.0 | $ 500.0 | $ 500.0 |  |  |  |  |
Depositary Stock Liquidation Preference |  |  | $ 25 |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding |  |  | 20,000 |  |  |  |  |  |  |
Series B-1 Preferred Stock |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Issued |  |  | 20,000 |  |  |  |  |  |  |
Series C Preferred Stock |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share |  |  | $ 1,000 |  |  |  |  |  |  |
Preferred Stock, Liquidation Preference, Value |  |  | $ 863.0 |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  |  |  |  |  |  |  | $ 0.01 |  |
Undivided Beneficial Ownership Interest, Percent |  |  |  |  |  |  |  | 10.00% |  |
Common Stock, Shares, Issued |  |  |  |  |  | 33,898,837 |  |  |  |
Preferred Stock, Shares Outstanding |  |  | 0 |  |  |  |  |  |  |
Gross Proceeds | Series A Preferred Stock |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock | $ 400.0 |  |  |  |  |  |  |  |  |
Gross Proceeds | Series B Preferred Stock |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock |  | $ 500.0 |  |  |  |  |  |  |  |
Preferred Stock | Series A Preferred Stock |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock | $ 393.9 |  |  |  |  |  |  |  |  |
Preferred Stock | Net Proceeds | Series B Preferred Stock |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock |  | $ 486.1 |  |  |  |  |  |  |  |

X
- Definition Common Stock Aggregate Sale Price + References No definition available. + Details
Name: | nix_CommonStockAggregateSalePrice
Namespace Prefix: | nix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Corporate Units Contract Annual Rate + References No definition available. + Details
Name: | nix_CorporateUnitsContractAnnualRate
Namespace Prefix: | nix_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Depositary Stock Liquidation Preference + References No definition available. + Details
Name: | nix_DepositaryStockLiquidationPreference
Namespace Prefix: | nix_
Data Type: | dtr-types1:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Equity Units Stock Purchase Contract Liability Payment + References No definition available. + Details
Name: | nix_EquityUnitsStockPurchaseContractLiabilityPayment
Namespace Prefix: | nix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Incremental Common Shares Attributable to Dilutive Effect of Equity Unit Purchase Agreements If-Converted + References No definition available. + Details
Name: | nix_IncrementalCommonSharesAttributableToDilutiveEffectOfEquityUnitPurchaseAgreementsIfConverted
Namespace Prefix: | nix_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Net Process from Sale + References No definition available. + Details
Name: | nix_NetProcessFromSale
Namespace Prefix: | nix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Preferred Stock Depositary Shares Issued + References No definition available. + Details
Name: | nix_PreferredStockDepositarySharesIssued
Namespace Prefix: | nix_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Preferred Stock, Dividend Rate, Initial Margin + References No definition available. + Details
Name: | nix_PreferredStockDividendRateInitialMargin
Namespace Prefix: | nix_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Preferred Stock, Dividend Rate, Initial Margin Plus 1.000% + References No definition available. + Details
Name: | nix_PreferredStockDividendRateInitialMarginPlus1.000
Namespace Prefix: | nix_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Preferred Stock Shares Redeemed + References No definition available. + Details
Name: | nix_PreferredStockSharesRedeemed
Namespace Prefix: | nix_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Purchase Contract Liability + References No definition available. + Details
Name: | nix_PurchaseContractLiability
Namespace Prefix: | nix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Undivided Beneficial Ownership Interest, Percent + References No definition available. + Details
Name: | nix_UndividedBeneficialOwnershipInterestPercent
Namespace Prefix: | nix_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_CommonStockSharesIssued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of excise and sales taxes included in sales and revenues, which are then deducted as a cost of sales. Includes excise taxes, which are applied to specific types of transactions or items (such as gasoline or alcohol); and sales, use and value added taxes, which are applied to a broad class of revenue-producing transactions involving a wide range of goods and services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 + Details
Name: | us-gaap_ExciseAndSalesTaxes
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ForwardContractIndexedToIssuersEquityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate amount of cumulative preferred dividends in arrears. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-5 + Details
Name: | us-gaap_PreferredStockAmountOfPreferredDividendsInArrears
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The percentage rate used to calculate dividend payments on preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-13 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-12A(Column A)(Footnote 3)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12(Column A)(Footnote 4)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column A)(Footnote 3)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-3 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14(Column A)(Footnote 3)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-6 + Details
Name: | us-gaap_PreferredStockDividendRatePercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-3 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-4 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-13 + Details
Name: | us-gaap_PreferredStockLiquidationPreference
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Value of the difference between preference in liquidation and the par or stated values of the preferred shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-13 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1 + Details
Name: | us-gaap_PreferredStockLiquidationPreferenceValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-13 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_PreferredStockParOrStatedValuePerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Per share amount of cumulative preferred dividends in arrears. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-5 + Details
Name: | us-gaap_PreferredStockPerShareAmountsOfPreferredDividendsInArrears
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The redemption (or callable) amount of currently redeemable preferred stock. Includes amounts representing dividends not currently declared or paid but which will be payable under the redemption features or for which ultimate payment is solely within the control of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-11 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.27(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_PreferredStockRedemptionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-13 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_PreferredStockSharesIssued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.6-05(4)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479617/946-210-S99-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-09(4)(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(16)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479617/946-210-S99-1 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-09(7)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-3 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_PreferredStockSharesOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Proceeds from issuance of capital stock which provides for a specific dividend that is paid to the shareholders before any dividends to common stockholders and which takes precedence over common stockholders in the event of liquidation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 14 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-14 + Details
Name: | us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Per share or per unit amount of equity securities issued. + References No definition available. + Details
Name: | us-gaap_SharesIssuedPricePerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_CapitalUnitsByClassAxis=nix_SeriesACorporateUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_SeriesAPreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_SeriesBPreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=nix_SeriesB1PreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_SeriesCPreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | nix_ProceedsAxis=nix_GrossProceedsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_PreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | nix_ProceedsAxis=nix_NetProceedsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |