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Long-Term Debt (Schedule of Consolidated Long-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2022	Aug. 30, 2022	Apr. 01, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Medium-Term Notes	$ 102.0			$ 132.0
Finance Lease, Liability	174.7			185.6
Senior Notes	9,353.0			9,003.0
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	(76.1)			(79.1)
Long-term Debt, Excluding Current Maturities	$ 9,553.6			9,241.5
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%	7.40%	7.99%
Medium-Term Notes	$ 29.0			49.0
NiSource | 5.00% Notes Due 2052
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	5.00%
Senior Notes	$ 350.0			0.0
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	7.64%
Medium-Term Notes	$ 58.0			68.0
NIPSCO | Finance Leases
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	1.87%
Finance Lease, Liability	$ 16.5			18.7
Columbia Of Ohio | Finance Leases
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	6.15%
Finance Lease, Liability	$ 83.5			87.8
NiSource Corporate Services | Finance Leases
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	2.34%
Finance Lease, Liability	$ 48.6			51.4
Columbia Of Virginia | Finance Leases
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	6.26%
Finance Lease, Liability	$ 17.0			17.7
Columbia Of Kentucky | Finance Leases
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	3.79%
Finance Lease, Liability	$ 0.2			0.2
Columbia Of Pennsylvania | Finance Leases
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	6.28%
Finance Lease, Liability	$ 8.9			$ 9.8

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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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