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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 | Dec. 31, 2020 | Dec. 31, 2019
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Transfers and Servicing [Abstract] |  |
Gross Receivables interest | $ 607.7 | $ 569.1
Less: Receivables not transferred | 607.7 | 215.9
Net receivables transferred | 0.0 | 353.2
Accounts receivable securitization agreements outstanding | $ 0.0 | $ 353.2

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- Definition Trade receivables available for transfer + References No definition available. + Details
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- Definition Trade receivables not transferred + References No definition available. + Details
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- Definition Trade receivables transferred, net + References No definition available. + Details
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Namespace Prefix: | nix_
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- 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
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- References No definition available. + Details
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