XML 77 R66.htm IDEA: XBRL DOCUMENT
v3.21.1

Transfers Of Financial Assets (Schedule Of Gross And Net Receivables Transferred As Well As Short-Term Borrowings Related To The Securitization Transactions) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Gross Receivables | $ 630.8 | $ 607.7
Less: Receivables not transferred | 630.8 | 607.7
Net receivables transferred | 0.0 | 0.0
Short-term debt due to asset securitization | $ 0.0 | $ 0.0

X
- Definition Trade receivables available for transfer + References No definition available. + Details
Name: | nix_TradeReceivablesAvailableForTransfer
Namespace Prefix: | nix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Trade receivables not transferred + References No definition available. + Details
Name: | nix_TradeReceivablesNotTransferred
Namespace Prefix: | nix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Trade receivables transferred, net + References No definition available. + Details
Name: | nix_TradeReceivablesTransferredNet
Namespace Prefix: | nix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Carrying amount of liabilities associated with financial assets accounted for as secured borrowings recognized in the transferor's statement of financial position at the end of each period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
Name: | us-gaap_TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant