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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 | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Gross Receivables | $ 361.6 | $ 450.8
Less: Receivables not transferred | 126.6 | 204.8
Net receivables transferred | 235.0 | 246.0
Accounts receivable securitization facility borrowings | $ 235.0 | $ 246.0

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

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

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

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=64858031&loc=SL6224234-111729 + Details
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Namespace Prefix: | us-gaap_
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