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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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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.

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