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Valuation and Qualifying Accounts (Tables) | 12 Months Ended
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Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
Schedule of Valuation and Qualifying Accounts Disclosure | NISOURCE INC. SCHEDULE II – VALUATION AND QUALIFYING ACCOUNTS
Twelve months ended December 31, 2020
|  |  | Additions |  |  |  |  |
($ in millions) | Balance Jan. 1, 2020 |  | Charged to Costs and Expenses |  | Charged to Other Account (1) |  |  | Deductions for Purposes for which Reserves were Created |  | Balance Dec. 31, 2020
Reserves Deducted in Consolidated Balance Sheet from Assets to Which They Apply: |  |  |  |  |  |  |  |  |  |
Reserve for accounts receivable | $ | 19.2 |  |  | $ | 31.6 |  |  | $ | 33.0 |  |  |  | $ | 31.5 |  |  | $ | 52.3 |
Reserve for other investments | 3.0 |  |  | — |  |  | — |  |  |  | 3.0 |  |  | — |
Twelve months ended December 31, 2019
|  |  | Additions |  |  |  |  |
($ in millions) | Balance Jan. 1, 2019 |  | Charged to Costs and Expenses |  | Charged to Other Account (1) |  |  | Deductions for Purposes for which Reserves were Created |  | Balance Dec. 31, 2019
Reserves Deducted in Consolidated Balance Sheet from Assets to Which They Apply: |  |  |  |  |  |  |  |  |  |
Reserve for accounts receivable | $ | 21.1 |  |  | $ | 21.6 |  |  | $ | 41.3 |  |  |  | $ | 64.8 |  |  | $ | 19.2 |
Reserve for other investments | 3.0 |  |  | — |  |  | — |  |  |  | — |  |  | 3.0 |
Twelve months ended December 31, 2018
|  |  | Additions |  |  |  |  |
($ in millions) | Balance Jan. 1, 2018 |  | Charged to Costs and Expenses |  | Charged to Other Account (1) |  |  | Deductions for Purposes for which Reserves were Created |  | Balance Dec. 31, 2018
Reserves Deducted in Consolidated Balance Sheet from Assets to Which They Apply: |  |  |  |  |  |  |  |  |  |
Reserve for accounts receivable | $ | 18.3 |  |  | $ | 20.2 |  |  | $ | 43.7 |  |  |  | $ | 61.1 |  |  | $ | 21.1 |
Reserve for other investments | 3.0 |  |  | — |  |  | — |  |  |  | — |  |  | 3.0 |
(1) Charged to Other Accounts reflects the deferral of bad debt expense to a regulatory asset.

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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- References No definition available. + Details
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