CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - I&M - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Adjustments to Reconcile Net Income to Net Cash Flows from Operating Activities:
Depreciation and Amortization	$ 2,566.1	$ 2,461.7
Deferred Income Taxes	123.6	89.5
Asset Impairments and Other Related Charges	0.0	142.5
Allowance for Equity Funds Used During Construction	(172.9)	(153.0)
Mark-to-Market of Risk Management Contracts	(192.6)	(97.6)
Deferred Fuel Over/Under-Recovery, Net	164.7	304.6
Change in Other Noncurrent Assets	(719.7)	(244.0)
Change in Other Noncurrent Liabilities	133.8	193.8
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(212.4)	(131.8)
Fuel, Materials and Supplies	150.7	188.5
Accounts Payable	327.3	14.2
Accrued Taxes, Net	(687.2)	(532.3)
Other Current Assets	37.7	(139.2)
Other Current Liabilities	74.3	161.8
Net Cash Flows from Operating Activities	5,130.8	5,076.9
INVESTING ACTIVITIES
Construction Expenditures	(6,001.2)	(5,168.6)
Purchases of Investment Securities	(2,407.0)	(2,398.0)
Sales of Investment Securities	2,349.2	2,343.5
Acquisitions of Nuclear Fuel	(88.9)	(98.4)
Other Investing Activities	43.5	73.0
Net Cash Flows Used for Investing Activities	(7,749.1)	(4,769.5)
FINANCING ACTIVITIES
Issuance of Long-term Debt	6,249.2	3,748.5
Retirement of Long-term Debt	(2,803.8)	(1,969.1)
Principal Payments for Finance Lease Obligations	(37.9)	(51.2)
Dividends Paid on Common Stock	(1,497.9)	(1,402.7)
Other Financing Activities	2.8	(50.4)
Net Cash Flows from (Used for) Financing Activities	3,479.1	(387.2)
Net Increase in Cash and Cash Equivalents	860.8	(79.8)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	246.0	379.0
Cash, Cash Equivalents and Restricted Cash at End of Period	1,106.8	299.2
SUPPLEMENTARY INFORMATION
Cash Paid for Interest, Net of Capitalized Amounts	1,315.1	1,247.3
Net Cash Paid (Received) for Income Taxes	60.1	87.9
Noncash Acquisitions Under Finance Leases	30.0	24.5
Construction Expenditures Included in Current Liabilities as of September 30,	1,168.8	1,015.1
Acquisition of Nuclear Fuel Included in Current Liabilities as of September 30,	1.4	8.2
I&M
OPERATING ACTIVITIES
Net Income	331.3	359.3
Adjustments to Reconcile Net Income to Net Cash Flows from Operating Activities:
Depreciation and Amortization	386.4	359.2
Deferred Income Taxes	(51.9)	(70.7)
Deferral of Incremental Nuclear Refueling Outage Expenses, Net	(40.0)	(3.2)
Asset Impairments and Other Related Charges	0.0	13.4
Allowance for Equity Funds Used During Construction	(13.1)	(10.1)
Mark-to-Market of Risk Management Contracts	7.8	16.3
Amortization of Nuclear Fuel	80.9	74.3
Deferred Fuel Over/Under-Recovery, Net	21.4	(13.7)
Change in Other Noncurrent Assets	(19.6)	24.4
Change in Other Noncurrent Liabilities	111.8	49.5
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(1.4)	(8.1)
Fuel, Materials and Supplies	38.9	13.8
Accounts Payable	78.5	(57.7)
Accrued Taxes, Net	(19.3)	(56.1)
Other Current Assets	9.8	(2.0)
Other Current Liabilities	19.4	(10.2)
Net Cash Flows from Operating Activities	940.9	678.4
INVESTING ACTIVITIES
Construction Expenditures	(478.3)	(434.7)
Change in Advances to Affiliates, Net	(157.2)	0.0
Purchases of Investment Securities	(2,386.5)	(2,389.0)
Sales of Investment Securities	2,332.2	2,336.0
Acquisitions of Nuclear Fuel	(88.9)	(98.4)
Other Investing Activities	31.2	5.7
Net Cash Flows Used for Investing Activities	(747.5)	(580.4)
FINANCING ACTIVITIES
Capital Contribution from Parent	8.7	5.0
Return of Capital to Parent	0.0	(1.8)
Issuance of Long-term Debt	249.0	80.4
Change in Advances from Affiliates, Net	(126.8)	13.7
Retirement of Long-term Debt	(269.9)	(76.1)
Principal Payments for Finance Lease Obligations	(4.8)	(5.2)
Dividends Paid on Common Stock	(50.0)	(112.5)
Other Financing Activities	0.7	0.5
Net Cash Flows from (Used for) Financing Activities	(193.1)	(96.0)
Net Increase in Cash and Cash Equivalents	0.3	2.0
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	1.5	2.1
Cash, Cash Equivalents and Restricted Cash at End of Period	1.8	4.1
SUPPLEMENTARY INFORMATION
Cash Paid for Interest, Net of Capitalized Amounts	111.1	111.5
Net Cash Paid (Received) for Income Taxes	0.9	(4.4)
Noncash Acquisitions Under Finance Leases	1.7	1.1
Construction Expenditures Included in Current Liabilities as of September 30,	74.9	69.6
Acquisition of Nuclear Fuel Included in Current Liabilities as of September 30,	$ 1.4	$ 8.2