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Long-Term Debt (Schedule of Consolidated Long-Term Debt (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Senior Notes | $ 9,003.0 | $ 9,003.0
Medium-Term Notes | 132.0 | 132.0
Finance Lease, Liability | 185.6 | 195.0
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | (79.1) | (86.9)
Long-term Debt, Excluding Current Maturities | $ 9,241.5 | 9,243.1
NiSource | 0.95% Notes Due 2025 |  |
Debt Instrument [Line Items] |  |
Debt, Weighted Average Interest Rate | 0.95% |
Senior Notes | $ 1,250.0 | 1,250.0
NiSource | 3.49% Notes due 2027 |  |
Debt Instrument [Line Items] |  |
Debt, Weighted Average Interest Rate | 3.49% |
Senior Notes | $ 1,000.0 | 1,000.0
NiSource | 6.78% Notes Due 2027 |  |
Debt Instrument [Line Items] |  |
Debt, Weighted Average Interest Rate | 6.78% |
Senior Notes | $ 3.0 | 3.0
NiSource | 2.95% Notes Due 2029 |  |
Debt Instrument [Line Items] |  |
Debt, Weighted Average Interest Rate | 2.95% |
Senior Notes | $ 750.0 | 750.0
NiSource | 3.60% Notes Due 2030 |  |
Debt Instrument [Line Items] |  |
Debt, Weighted Average Interest Rate | 3.60% |
Senior Notes | $ 1,000.0 | 1,000.0
NiSource | 1.70% Notes Due 2031 |  |
Debt Instrument [Line Items] |  |
Debt, Weighted Average Interest Rate | 1.70% |
Senior Notes | $ 750.0 | 750.0
NiSource | 6.25% Notes Due 2040 |  |
Debt Instrument [Line Items] |  |
Debt, Weighted Average Interest Rate | 6.25% |
Senior Notes | $ 152.6 | 152.6
NiSource | 5.95% Notes Due 2041 |  |
Debt Instrument [Line Items] |  |
Debt, Weighted Average Interest Rate | 5.95% |
Senior Notes | $ 347.4 | 347.4
NiSource | 5.80% Notes Due 2042 |  |
Debt Instrument [Line Items] |  |
Debt, Weighted Average Interest Rate | 5.80% |
Senior Notes | $ 250.0 | 250.0
NiSource | 5.25% Notes Due 2043 |  |
Debt Instrument [Line Items] |  |
Debt, Weighted Average Interest Rate | 5.25% |
Senior Notes | $ 500.0 | 500.0
NiSource | 4.80% Notes due 2044 |  |
Debt Instrument [Line Items] |  |
Debt, Weighted Average Interest Rate | 4.80% |
Senior Notes | $ 750.0 | 750.0
NiSource | 5.65% Notes Due 2045 |  |
Debt Instrument [Line Items] |  |
Debt, Weighted Average Interest Rate | 5.65% |
Senior Notes | $ 500.0 | 500.0
NiSource | 4.375% Notes due 2047 |  |
Debt Instrument [Line Items] |  |
Debt, Weighted Average Interest Rate | 4.38% |
Senior Notes | $ 1,000.0 | 1,000.0
NiSource | 3.95% Notes Due 2048 |  |
Debt Instrument [Line Items] |  |
Debt, Weighted Average Interest Rate | 3.95% |
Senior Notes | $ 750.0 | 750.0
NiSource | Medium-term Notes |  |
Debt Instrument [Line Items] |  |
Debt, Weighted Average Interest Rate | 7.99% |
Medium-Term Notes | $ 49.0 | 49.0
Columbia Of Massachusetts | Medium-term Notes |  |
Debt Instrument [Line Items] |  |
Debt, Weighted Average Interest Rate | 6.37% |
Medium-Term Notes | $ 15.0 | 15.0
NIPSCO | Medium-term Notes |  |
Debt Instrument [Line Items] |  |
Debt, Weighted Average Interest Rate | 7.61% |
Medium-Term Notes | $ 68.0 | 68.0
NIPSCO | Finance Leases |  |
Debt Instrument [Line Items] |  |
Debt, Weighted Average Interest Rate | 1.86% |
Finance Lease, Liability | $ 18.7 | 16.0
Columbia Of Ohio | Finance Leases |  |
Debt Instrument [Line Items] |  |
Debt, Weighted Average Interest Rate | 6.15% |
Finance Lease, Liability | $ 87.8 | 91.2
NiSource Corporate Services | Finance Leases |  |
Debt Instrument [Line Items] |  |
Debt, Weighted Average Interest Rate | 1.73% |
Finance Lease, Liability | $ 51.4 | 49.4
Columbia Of Virginia | Finance Leases |  |
Debt Instrument [Line Items] |  |
Debt, Weighted Average Interest Rate | 6.28% |
Finance Lease, Liability | $ 17.7 | 18.4
Columbia Of Kentucky | Finance Leases |  |
Debt Instrument [Line Items] |  |
Debt, Weighted Average Interest Rate | 3.79% |
Finance Lease, Liability | $ 0.2 | 0.3
Columbia Of Pennsylvania | Finance Leases |  |
Debt Instrument [Line Items] |  |
Debt, Weighted Average Interest Rate | 6.35% |
Finance Lease, Liability | $ 9.8 | $ 19.7

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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