v3.25.2
FAIR VALUE MEASUREMENTS - Changes in Fair Value (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning Balance $ 122.8 $ 119.1 $ 165.6 $ 139.4
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) 52.7 42.5 154.3 90.8
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date (3.4) 4.5 16.8 13.9
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income (0.8) 0.9 5.9 1.7
Settlements (101.2) (64.3) (263.2) (158.3)
Transfers into Level 3 5.4 2.5 (0.3) 7.1
Transfers out of Level 3 (2.2) (0.2) 0.2 1.9
Changes in Fair Value Allocated to Regulated Jurisdiction 309.5 183.2 303.5 191.7
Ending Balance 382.8 288.2 382.8 288.2
APCo        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning Balance 8.0 4.0 35.2 22.4
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) 10.1 15.7 49.4 24.1
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date 0.0 0.0 0.0 0.0
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income 0.0 0.0 0.0 0.0
Settlements (18.1) (19.7) (84.6) (46.5)
Transfers into Level 3 0.0 0.0 0.0 0.0
Transfers out of Level 3 0.0 0.0 0.0 0.0
Changes in Fair Value Allocated to Regulated Jurisdiction 108.3 67.8 108.3 67.8
Ending Balance 108.3 67.8 108.3 67.8
I&M        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning Balance 3.9 1.0 6.4 2.8
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) 2.9 4.1 12.9 7.3
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date 0.0 0.0 0.0 0.0
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income 0.0 0.0 0.0 0.0
Settlements (6.9) (5.2) (19.2) (10.0)
Transfers into Level 3 0.0 0.0 0.0 0.0
Transfers out of Level 3 0.0 0.0 0.0 0.0
Changes in Fair Value Allocated to Regulated Jurisdiction 12.4 14.6 12.2 14.4
Ending Balance 12.3 14.5 12.3 14.5
OPCo        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning Balance (51.2) (41.0) (47.5) (50.6)
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) (0.2) 0.0 0.0 (0.8)
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date 0.0 0.0 0.0 0.0
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income 0.0 0.0 0.0 0.0
Settlements 2.1 2.3 4.3 4.9
Transfers into Level 3 0.0 0.0 0.0 0.0
Transfers out of Level 3 0.0 0.0 0.0 0.0
Changes in Fair Value Allocated to Regulated Jurisdiction 1.6 (4.5) (4.5) 3.3
Ending Balance (47.7) (43.2) (47.7) (43.2)
PSO        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning Balance 15.4 7.7 20.0 18.6
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) 17.6 7.5 37.9 26.2
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date 0.0 0.0 0.0 0.0
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income 0.0 0.0 0.0 0.0
Settlements (32.9) (15.2) (57.9) (44.8)
Transfers into Level 3 0.0 0.0 0.0 0.0
Transfers out of Level 3 0.0 0.0 0.0 0.0
Changes in Fair Value Allocated to Regulated Jurisdiction 96.8 49.4 96.9 49.4
Ending Balance 96.9 49.4 96.9 49.4
SWEPCo        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning Balance 13.1 5.3 17.5 11.1
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) 18.6 8.4 42.2 23.6
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date 0.0 0.0 0.0 0.0
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income 0.0 0.0 0.0 0.0
Settlements (31.7) (13.6) (59.7) (36.0)
Transfers into Level 3 0.0 0.0 0.0 0.0
Transfers out of Level 3 0.0 0.0 0.0 0.5
Changes in Fair Value Allocated to Regulated Jurisdiction 69.1 38.0 69.1 38.9
Ending Balance $ 69.1 $ 38.1 $ 69.1 $ 38.1