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Comprehensive Income (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Sep. 30, 2022
Mar. 31, 2022
Changes in Accumulated Other Comprehensive Income (Loss) by Component      
Beginning Balance in AOCI $ 83.7   $ 184.8
Change in Fair Value Recognized in AOCI (203.0)   285.0
Commodity      
Generation & Marketing Revenues 4,690.9   4,592.6
Interest Rate      
Interest Expense 415.7   313.4
Amortization Of Pension And Other Postretirement Benefit Plans      
Reclassification from AOCI, before Income Tax (Expense) Benefit 43.6   (49.7)
Income Tax (Expense) Benefit 10.4   52.8
Reclassification from AOCI, Net of Income Tax (Expense) Benefit 34.5   (39.2)
Net Current Period Other Comprehensive Income (Loss) (151.8)   245.8
Ending Balance in AOCI (68.1)   430.6
Reclassification of KPCo Pension and OPEB Regulatory Assets from AOCI      
Amortization Of Pension And Other Postretirement Benefit Plans      
Reclassification from AOCI, before Income Tax (Expense) Benefit 21.1    
Reclassification from AOCI, Net of Income Tax (Expense) Benefit 16.7    
Cash Flow Hedges [Member] | Interest Rate [Member]      
Changes in Accumulated Other Comprehensive Income (Loss) by Component      
Beginning Balance in AOCI 0.3   (21.3)
Change in Fair Value Recognized in AOCI 5.2   6.8
Amortization Of Pension And Other Postretirement Benefit Plans      
Reclassification from AOCI, before Income Tax (Expense) Benefit 0.7   1.1
Reclassification from AOCI, Net of Income Tax (Expense) Benefit 0.6   0.9
Net Current Period Other Comprehensive Income (Loss) 5.8   7.7
Ending Balance in AOCI 6.1   (13.6)
Cash Flow Hedges [Member] | Interest Rate [Member] | Reclassification of KPCo Pension and OPEB Regulatory Assets from AOCI      
Amortization Of Pension And Other Postretirement Benefit Plans      
Reclassification from AOCI, before Income Tax (Expense) Benefit 0.0    
Reclassification from AOCI, Net of Income Tax (Expense) Benefit 0.0    
Cash Flow Hedges [Member] | Commodity [Member]      
Changes in Accumulated Other Comprehensive Income (Loss) by Component      
Beginning Balance in AOCI 223.5   163.7
Change in Fair Value Recognized in AOCI (195.3)   278.2
Amortization Of Pension And Other Postretirement Benefit Plans      
Reclassification from AOCI, before Income Tax (Expense) Benefit 47.0   (48.0)
Reclassification from AOCI, Net of Income Tax (Expense) Benefit 37.1   (37.9)
Net Current Period Other Comprehensive Income (Loss) (158.2)   240.3
Ending Balance in AOCI 65.3   404.0
Cash Flow Hedges [Member] | Commodity [Member] | Reclassification of KPCo Pension and OPEB Regulatory Assets from AOCI      
Amortization Of Pension And Other Postretirement Benefit Plans      
Reclassification from AOCI, before Income Tax (Expense) Benefit 0.0    
Reclassification from AOCI, Net of Income Tax (Expense) Benefit 0.0    
Pension and OPEB [Member]      
Changes in Accumulated Other Comprehensive Income (Loss) by Component      
Beginning Balance in AOCI (140.1)   42.4
Change in Fair Value Recognized in AOCI (12.9)   0.0
Amortization Of Pension And Other Postretirement Benefit Plans      
Reclassification from AOCI, before Income Tax (Expense) Benefit (4.1)   (2.8)
Reclassification from AOCI, Net of Income Tax (Expense) Benefit (3.2)   (2.2)
Net Current Period Other Comprehensive Income (Loss) 0.6   (2.2)
Ending Balance in AOCI (139.5)   40.2
Pension and OPEB [Member] | Reclassification of KPCo Pension and OPEB Regulatory Assets from AOCI      
Amortization Of Pension And Other Postretirement Benefit Plans      
Reclassification from AOCI, before Income Tax (Expense) Benefit 21.1    
Reclassification from AOCI, Net of Income Tax (Expense) Benefit 16.7    
Accumulated Other Comprehensive Income [Member]      
Amortization Of Pension And Other Postretirement Benefit Plans      
Net Current Period Other Comprehensive Income (Loss)   $ (151.8) 245.8
Generation and Marketing [Member]      
Commodity      
Generation & Marketing Revenues 326.9   609.5
Reclassifications from Accumulated Other Comprehensive Income [Member]      
Interest Rate      
Interest Expense [1] 0.7   1.1
Amortization Of Pension And Other Postretirement Benefit Plans      
Amortization of Prior Service Cost (Credit) (5.3)   (4.9)
Amortization of Actuarial (Gains) Losses 1.2   2.1
Income Tax (Expense) Benefit 9.1   (10.5)
Reclassifications from Accumulated Other Comprehensive Income [Member] | Reclassification of KPCo Pension and OPEB Regulatory Assets from AOCI      
Amortization Of Pension And Other Postretirement Benefit Plans      
Income Tax (Expense) Benefit 4.4    
Reclassifications from Accumulated Other Comprehensive Income [Member] | Cash Flow Hedges [Member] | Interest Rate [Member]      
Interest Rate      
Interest Expense [1] 0.7   1.1
Amortization Of Pension And Other Postretirement Benefit Plans      
Amortization of Prior Service Cost (Credit) 0.0   0.0
Amortization of Actuarial (Gains) Losses 0.0   0.0
Income Tax (Expense) Benefit 0.1   0.2
Reclassifications from Accumulated Other Comprehensive Income [Member] | Cash Flow Hedges [Member] | Interest Rate [Member] | Reclassification of KPCo Pension and OPEB Regulatory Assets from AOCI      
Amortization Of Pension And Other Postretirement Benefit Plans      
Income Tax (Expense) Benefit 0.0    
Reclassifications from Accumulated Other Comprehensive Income [Member] | Cash Flow Hedges [Member] | Commodity [Member]      
Interest Rate      
Interest Expense [1] 0.0   0.0
Amortization Of Pension And Other Postretirement Benefit Plans      
Amortization of Prior Service Cost (Credit) 0.0   0.0
Amortization of Actuarial (Gains) Losses 0.0   0.0
Income Tax (Expense) Benefit 9.9   (10.1)
Reclassifications from Accumulated Other Comprehensive Income [Member] | Cash Flow Hedges [Member] | Commodity [Member] | Reclassification of KPCo Pension and OPEB Regulatory Assets from AOCI      
Amortization Of Pension And Other Postretirement Benefit Plans      
Income Tax (Expense) Benefit 0.0    
Reclassifications from Accumulated Other Comprehensive Income [Member] | Pension and OPEB [Member]      
Interest Rate      
Interest Expense [1] 0.0   0.0
Amortization Of Pension And Other Postretirement Benefit Plans      
Amortization of Prior Service Cost (Credit) (5.3)   (4.9)
Amortization of Actuarial (Gains) Losses 1.2   2.1
Income Tax (Expense) Benefit (0.9)   (0.6)
Reclassifications from Accumulated Other Comprehensive Income [Member] | Pension and OPEB [Member] | Reclassification of KPCo Pension and OPEB Regulatory Assets from AOCI      
Amortization Of Pension And Other Postretirement Benefit Plans      
Income Tax (Expense) Benefit 4.4    
Reclassifications from Accumulated Other Comprehensive Income [Member] | Generation and Marketing [Member]      
Commodity      
Generation & Marketing Revenues [1]     (0.1)
Reclassifications from Accumulated Other Comprehensive Income [Member] | Generation and Marketing [Member] | Cash Flow Hedges [Member] | Interest Rate [Member]      
Commodity      
Generation & Marketing Revenues [1]     0.0
Reclassifications from Accumulated Other Comprehensive Income [Member] | Generation and Marketing [Member] | Cash Flow Hedges [Member] | Commodity [Member]      
Commodity      
Generation & Marketing Revenues [1]     (0.1)
Reclassifications from Accumulated Other Comprehensive Income [Member] | Generation and Marketing [Member] | Pension and OPEB [Member]      
Commodity      
Generation & Marketing Revenues [1]     0.0
Reclassifications from Accumulated Other Comprehensive Income [Member] | Purchased Electricity for Resale [Member]      
Commodity      
Purchased Electricity for Resale [1] 47.0   (47.9)
Reclassifications from Accumulated Other Comprehensive Income [Member] | Purchased Electricity for Resale [Member] | Cash Flow Hedges [Member] | Interest Rate [Member]      
Commodity      
Purchased Electricity for Resale [1] 0.0   0.0
Reclassifications from Accumulated Other Comprehensive Income [Member] | Purchased Electricity for Resale [Member] | Cash Flow Hedges [Member] | Commodity [Member]      
Commodity      
Purchased Electricity for Resale [1] 47.0   (47.9)
Reclassifications from Accumulated Other Comprehensive Income [Member] | Purchased Electricity for Resale [Member] | Pension and OPEB [Member]      
Commodity      
Purchased Electricity for Resale [1] 0.0   0.0
AEP Texas Inc. [Member]      
Changes in Accumulated Other Comprehensive Income (Loss) by Component      
Beginning Balance in AOCI (8.6)   (6.5)
Change in Fair Value Recognized in AOCI (0.7)   0.0
Interest Rate      
Interest Expense 56.9   45.5
Amortization Of Pension And Other Postretirement Benefit Plans      
Reclassification from AOCI, before Income Tax (Expense) Benefit 0.2   0.4
Income Tax (Expense) Benefit 10.7   15.7
Reclassification from AOCI, Net of Income Tax (Expense) Benefit 0.1   0.3
Net Current Period Other Comprehensive Income (Loss) (0.6)   0.3
Ending Balance in AOCI (9.2)   (6.2)
AEP Texas Inc. [Member] | Cash Flow Hedges [Member] | Interest Rate [Member]      
Changes in Accumulated Other Comprehensive Income (Loss) by Component      
Beginning Balance in AOCI (0.3)   (1.3)
Change in Fair Value Recognized in AOCI (0.2)   0.0
Amortization Of Pension And Other Postretirement Benefit Plans      
Reclassification from AOCI, before Income Tax (Expense) Benefit 0.3   0.4
Reclassification from AOCI, Net of Income Tax (Expense) Benefit 0.2   0.3
Net Current Period Other Comprehensive Income (Loss) 0.0   0.3
Ending Balance in AOCI (0.3)   (1.0)
AEP Texas Inc. [Member] | Pension and OPEB [Member]      
Changes in Accumulated Other Comprehensive Income (Loss) by Component      
Beginning Balance in AOCI (8.3)   (5.2)
Change in Fair Value Recognized in AOCI (0.5)   0.0
Amortization Of Pension And Other Postretirement Benefit Plans      
Reclassification from AOCI, before Income Tax (Expense) Benefit (0.1)   0.0
Reclassification from AOCI, Net of Income Tax (Expense) Benefit (0.1)   0.0
Net Current Period Other Comprehensive Income (Loss) (0.6)   0.0
Ending Balance in AOCI (8.9)   (5.2)
AEP Texas Inc. [Member] | Accumulated Other Comprehensive Income [Member]      
Amortization Of Pension And Other Postretirement Benefit Plans      
Net Current Period Other Comprehensive Income (Loss) (0.6)   0.3
AEP Texas Inc. [Member] | Reclassifications from Accumulated Other Comprehensive Income [Member]      
Interest Rate      
Interest Expense [1] 0.3   0.4
Amortization Of Pension And Other Postretirement Benefit Plans      
Amortization of Prior Service Cost (Credit) (0.1)    
Income Tax (Expense) Benefit 0.1   0.1
AEP Texas Inc. [Member] | Reclassifications from Accumulated Other Comprehensive Income [Member] | Cash Flow Hedges [Member] | Interest Rate [Member]      
Interest Rate      
Interest Expense [1] 0.3   0.4
Amortization Of Pension And Other Postretirement Benefit Plans      
Amortization of Prior Service Cost (Credit) 0.0    
Income Tax (Expense) Benefit 0.1   0.1
AEP Texas Inc. [Member] | Reclassifications from Accumulated Other Comprehensive Income [Member] | Pension and OPEB [Member]      
Interest Rate      
Interest Expense [1] 0.0   0.0
Amortization Of Pension And Other Postretirement Benefit Plans      
Amortization of Prior Service Cost (Credit) (0.1)    
Income Tax (Expense) Benefit 0.0   0.0
Appalachian Power Co [Member]      
Changes in Accumulated Other Comprehensive Income (Loss) by Component      
Beginning Balance in AOCI (4.8)   24.4
Change in Fair Value Recognized in AOCI (0.1)   0.0
Interest Rate      
Interest Expense 65.3   54.3
Amortization Of Pension And Other Postretirement Benefit Plans      
Reclassification from AOCI, before Income Tax (Expense) Benefit (1.2)   (1.7)
Income Tax (Expense) Benefit 31.6   27.3
Reclassification from AOCI, Net of Income Tax (Expense) Benefit (0.9)   (1.3)
Net Current Period Other Comprehensive Income (Loss) (1.0)   (1.3)
Ending Balance in AOCI (5.8)   23.1
Appalachian Power Co [Member] | Cash Flow Hedges [Member] | Interest Rate [Member]      
Changes in Accumulated Other Comprehensive Income (Loss) by Component      
Beginning Balance in AOCI 6.7   7.5
Change in Fair Value Recognized in AOCI 0.0   0.0
Amortization Of Pension And Other Postretirement Benefit Plans      
Reclassification from AOCI, before Income Tax (Expense) Benefit (0.3)   (0.3)
Reclassification from AOCI, Net of Income Tax (Expense) Benefit (0.2)   (0.2)
Net Current Period Other Comprehensive Income (Loss) (0.2)   (0.2)
Ending Balance in AOCI 6.5   7.3
Appalachian Power Co [Member] | Pension and OPEB [Member]      
Changes in Accumulated Other Comprehensive Income (Loss) by Component      
Beginning Balance in AOCI (11.5)   16.9
Change in Fair Value Recognized in AOCI (0.1)   0.0
Amortization Of Pension And Other Postretirement Benefit Plans      
Reclassification from AOCI, before Income Tax (Expense) Benefit (0.9)   (1.4)
Reclassification from AOCI, Net of Income Tax (Expense) Benefit (0.7)   (1.1)
Net Current Period Other Comprehensive Income (Loss) (0.8)   (1.1)
Ending Balance in AOCI (12.3)   15.8
Appalachian Power Co [Member] | Accumulated Other Comprehensive Income [Member]      
Amortization Of Pension And Other Postretirement Benefit Plans      
Net Current Period Other Comprehensive Income (Loss) (1.0)   (1.3)
Appalachian Power Co [Member] | Reclassifications from Accumulated Other Comprehensive Income [Member]      
Interest Rate      
Interest Expense [1] (0.3)   (0.3)
Amortization Of Pension And Other Postretirement Benefit Plans      
Amortization of Prior Service Cost (Credit) (1.2)   (1.4)
Amortization of Actuarial (Gains) Losses 0.3    
Income Tax (Expense) Benefit (0.3)   (0.4)
Appalachian Power Co [Member] | Reclassifications from Accumulated Other Comprehensive Income [Member] | Cash Flow Hedges [Member] | Interest Rate [Member]      
Interest Rate      
Interest Expense [1] (0.3)   (0.3)
Amortization Of Pension And Other Postretirement Benefit Plans      
Amortization of Prior Service Cost (Credit) 0.0   0.0
Amortization of Actuarial (Gains) Losses 0.0    
Income Tax (Expense) Benefit (0.1)   (0.1)
Appalachian Power Co [Member] | Reclassifications from Accumulated Other Comprehensive Income [Member] | Pension and OPEB [Member]      
Interest Rate      
Interest Expense [1] 0.0   0.0
Amortization Of Pension And Other Postretirement Benefit Plans      
Amortization of Prior Service Cost (Credit) (1.2)   (1.4)
Amortization of Actuarial (Gains) Losses 0.3    
Income Tax (Expense) Benefit (0.2)   (0.3)
Indiana Michigan Power Co [Member]      
Changes in Accumulated Other Comprehensive Income (Loss) by Component      
Beginning Balance in AOCI (0.3)   (1.3)
Change in Fair Value Recognized in AOCI (2.8)   0.0
Interest Rate      
Interest Expense 33.2   30.3
Amortization Of Pension And Other Postretirement Benefit Plans      
Reclassification from AOCI, before Income Tax (Expense) Benefit 0.3   0.4
Income Tax (Expense) Benefit 18.3   1.1
Reclassification from AOCI, Net of Income Tax (Expense) Benefit 0.2   0.3
Net Current Period Other Comprehensive Income (Loss) (2.6)   0.3
Ending Balance in AOCI (2.9)   (1.0)
Indiana Michigan Power Co [Member] | Cash Flow Hedges [Member] | Interest Rate [Member]      
Changes in Accumulated Other Comprehensive Income (Loss) by Component      
Beginning Balance in AOCI (5.1)   (6.7)
Change in Fair Value Recognized in AOCI (1.1)   0.0
Amortization Of Pension And Other Postretirement Benefit Plans      
Reclassification from AOCI, before Income Tax (Expense) Benefit 0.5   0.5
Reclassification from AOCI, Net of Income Tax (Expense) Benefit 0.4   0.4
Net Current Period Other Comprehensive Income (Loss) (0.7)   0.4
Ending Balance in AOCI (5.8)   (6.3)
Indiana Michigan Power Co [Member] | Pension and OPEB [Member]      
Changes in Accumulated Other Comprehensive Income (Loss) by Component      
Beginning Balance in AOCI 4.8   5.4
Change in Fair Value Recognized in AOCI (1.7)   0.0
Amortization Of Pension And Other Postretirement Benefit Plans      
Reclassification from AOCI, before Income Tax (Expense) Benefit (0.2)   (0.1)
Reclassification from AOCI, Net of Income Tax (Expense) Benefit (0.2)   (0.1)
Net Current Period Other Comprehensive Income (Loss) (1.9)   (0.1)
Ending Balance in AOCI 2.9   5.3
Indiana Michigan Power Co [Member] | Accumulated Other Comprehensive Income [Member]      
Amortization Of Pension And Other Postretirement Benefit Plans      
Net Current Period Other Comprehensive Income (Loss) (2.6)   0.3
Indiana Michigan Power Co [Member] | Reclassifications from Accumulated Other Comprehensive Income [Member]      
Interest Rate      
Interest Expense [1] 0.5   0.5
Amortization Of Pension And Other Postretirement Benefit Plans      
Amortization of Prior Service Cost (Credit) (0.3)   (0.2)
Amortization of Actuarial (Gains) Losses 0.1   0.1
Income Tax (Expense) Benefit 0.1   0.1
Indiana Michigan Power Co [Member] | Reclassifications from Accumulated Other Comprehensive Income [Member] | Cash Flow Hedges [Member] | Interest Rate [Member]      
Interest Rate      
Interest Expense [1] 0.5   0.5
Amortization Of Pension And Other Postretirement Benefit Plans      
Amortization of Prior Service Cost (Credit) 0.0   0.0
Amortization of Actuarial (Gains) Losses 0.0   0.0
Income Tax (Expense) Benefit 0.1   0.1
Indiana Michigan Power Co [Member] | Reclassifications from Accumulated Other Comprehensive Income [Member] | Pension and OPEB [Member]      
Interest Rate      
Interest Expense [1] 0.0   0.0
Amortization Of Pension And Other Postretirement Benefit Plans      
Amortization of Prior Service Cost (Credit) (0.3)   (0.2)
Amortization of Actuarial (Gains) Losses 0.1   0.1
Income Tax (Expense) Benefit 0.0   0.0
Public Service Co Of Oklahoma [Member]      
Changes in Accumulated Other Comprehensive Income (Loss) by Component      
Beginning Balance in AOCI 1.3    
Interest Rate      
Interest Expense 25.2   18.9
Amortization Of Pension And Other Postretirement Benefit Plans      
Income Tax (Expense) Benefit 0.8   (1.0)
Net Current Period Other Comprehensive Income (Loss) (1.5)    
Ending Balance in AOCI (0.2)    
Public Service Co Of Oklahoma [Member] | Cash Flow Hedges [Member] | Interest Rate [Member]      
Changes in Accumulated Other Comprehensive Income (Loss) by Component      
Beginning Balance in AOCI 1.3   0.0
Change in Fair Value Recognized in AOCI (1.5)   0.0
Amortization Of Pension And Other Postretirement Benefit Plans      
Reclassification from AOCI, before Income Tax (Expense) Benefit 0.0   0.0
Reclassification from AOCI, Net of Income Tax (Expense) Benefit 0.0   0.0
Net Current Period Other Comprehensive Income (Loss) (1.5)   0.0
Ending Balance in AOCI (0.2)   0.0
Public Service Co Of Oklahoma [Member] | Accumulated Other Comprehensive Income [Member]      
Amortization Of Pension And Other Postretirement Benefit Plans      
Net Current Period Other Comprehensive Income (Loss) (1.5)    
Public Service Co Of Oklahoma [Member] | Reclassifications from Accumulated Other Comprehensive Income [Member] | Cash Flow Hedges [Member] | Interest Rate [Member]      
Interest Rate      
Interest Expense [1] 0.0   0.0
Amortization Of Pension And Other Postretirement Benefit Plans      
Income Tax (Expense) Benefit 0.0   0.0
Southwestern Electric Power Co [Member]      
Changes in Accumulated Other Comprehensive Income (Loss) by Component      
Beginning Balance in AOCI (4.2)   6.7
Change in Fair Value Recognized in AOCI 0.5   0.0
Interest Rate      
Interest Expense 25.0   33.1
Amortization Of Pension And Other Postretirement Benefit Plans      
Reclassification from AOCI, before Income Tax (Expense) Benefit (0.5)   (0.4)
Income Tax (Expense) Benefit (4.0)   (2.2)
Reclassification from AOCI, Net of Income Tax (Expense) Benefit (0.4)   (0.3)
Net Current Period Other Comprehensive Income (Loss) 0.1   (0.3)
Ending Balance in AOCI (4.1)   6.4
Southwestern Electric Power Co [Member] | Cash Flow Hedges [Member] | Interest Rate [Member]      
Changes in Accumulated Other Comprehensive Income (Loss) by Component      
Beginning Balance in AOCI 1.1   1.2
Change in Fair Value Recognized in AOCI 0.5   0.0
Amortization Of Pension And Other Postretirement Benefit Plans      
Reclassification from AOCI, before Income Tax (Expense) Benefit (0.1)   0.1
Reclassification from AOCI, Net of Income Tax (Expense) Benefit (0.1)   0.1
Net Current Period Other Comprehensive Income (Loss) 0.4   0.1
Ending Balance in AOCI 1.5   1.3
Southwestern Electric Power Co [Member] | Pension and OPEB [Member]      
Changes in Accumulated Other Comprehensive Income (Loss) by Component      
Beginning Balance in AOCI (5.3)   5.5
Change in Fair Value Recognized in AOCI 0.0   0.0
Amortization Of Pension And Other Postretirement Benefit Plans      
Reclassification from AOCI, before Income Tax (Expense) Benefit (0.4)   (0.5)
Reclassification from AOCI, Net of Income Tax (Expense) Benefit (0.3)   (0.4)
Net Current Period Other Comprehensive Income (Loss) (0.3)   (0.4)
Ending Balance in AOCI (5.6)   5.1
Southwestern Electric Power Co [Member] | Accumulated Other Comprehensive Income [Member]      
Amortization Of Pension And Other Postretirement Benefit Plans      
Net Current Period Other Comprehensive Income (Loss) 0.1   (0.3)
Southwestern Electric Power Co [Member] | Reclassifications from Accumulated Other Comprehensive Income [Member]      
Interest Rate      
Interest Expense [1] (0.1)   0.1
Amortization Of Pension And Other Postretirement Benefit Plans      
Amortization of Prior Service Cost (Credit) (0.5)   (0.5)
Amortization of Actuarial (Gains) Losses 0.1    
Income Tax (Expense) Benefit (0.1)   (0.1)
Southwestern Electric Power Co [Member] | Reclassifications from Accumulated Other Comprehensive Income [Member] | Cash Flow Hedges [Member] | Interest Rate [Member]      
Interest Rate      
Interest Expense [1] (0.1)   0.1
Amortization Of Pension And Other Postretirement Benefit Plans      
Amortization of Prior Service Cost (Credit) 0.0   0.0
Amortization of Actuarial (Gains) Losses 0.0    
Income Tax (Expense) Benefit 0.0   0.0
Southwestern Electric Power Co [Member] | Reclassifications from Accumulated Other Comprehensive Income [Member] | Pension and OPEB [Member]      
Interest Rate      
Interest Expense [1] 0.0   0.0
Amortization Of Pension And Other Postretirement Benefit Plans      
Amortization of Prior Service Cost (Credit) (0.5)   (0.5)
Amortization of Actuarial (Gains) Losses 0.1    
Income Tax (Expense) Benefit $ (0.1)   $ (0.1)
[1] Amounts reclassified to the referenced line item on the statements of income.