Leases (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Lease Rental Costs
Operating Lease, Cost	$ 64.4	$ 200.3
Finance Lease Right-of-Use Asset Amortization	16.5	45.0
Interest Expense on Finance Leases	4.1	12.2
Total Lease Rental Costs	$ 85.0	$ 257.5
Supplemental Information Related to Leases
Weighted-Average Remaining Lease Term, Operating Leases	5 years 3 months 21 days	5 years 3 months 21 days
Weighted Average Remaining Lease Term, Finance Leases	5 years 10 months 13 days	5 years 10 months 13 days
Weighted Average Discount Rate, Operating Leases	3.61%	3.61%
Weighted Average Discount Rate, Finance Leases	6.02%	6.02%
Operating Cash Flows Used for Operating Leases		$ 163.6
Operating Cash Flows Used for Finance Leases		11.0
Financing Cash Flows Used for Finance Leases		44.5	$ 49.4
Non-cash Acquisitions Under Operating Leases		108.9
Property, Plant and Equipment and Other Related Obligations Under Finance Leases
Generation	$ 22,624.4	22,624.4		$ 21,699.9
Other Property, Plant and Equipment	4,510.2	4,510.2		4,265.0
Total Property, Plant and Equipment	77,452.9	77,452.9		73,085.2
Accumulated Amortization	18,760.2	18,760.2		17,986.1
Net Property, Plant and Equipment Under Finance Leases	308.1	308.1
Obligations Under Finance Leases Noncurrent	790.0	790.0		782.6
Finance Lease Liability Due Within One Year	1,032.4	1,032.4		1,190.5
Total Obligations Under Finance Leases	315.4	315.4
Operating Lease Asset and Related Obligations
Operating Lease Assets	990.0	990.0		0.0
Operating Lease Assets, Noncurrent	11,041.6	11,041.6		9,589.8
Operating Lease Noncurrent Liability	801.1	801.1		0.0
Operating Lease Liability Due Within One Year	228.8	228.8		0.0
Estimated Present Value of Future Minimum Lease Payments on Operating Leases	1,029.9	1,029.9
Finance Lease Liabilities Rolling Future Minimum Lease Payments
Finance Leases, Year 1	76.8	76.8
Finance Leases, Year 2	67.0	67.0
Finance Leases, Year 3	58.0	58.0
Finance Leases, Year 4	49.0	49.0
Finance Leases, Year 5	50.0	50.0
Finance Leases, Later Years	76.1	76.1
Finance Leases, Total Future Minimum Lease Payments	376.9	376.9
Imputed Interest on Finance Leases	61.5	61.5
Total Obligations Under Finance Leases	315.4	315.4
Operating Lease Liabilities Rolling Future Minimum Lease Payments
Operating Leases, Year 1	267.5	267.5
Operating Leases, Year 2	252.4	252.4
Operating Leases, Year 3	239.9	239.9
Operating Leases, Year 4	154.2	154.2
Operating Leases, Year 5	63.6	63.6
Operating Leases, Later Years	184.1	184.1
Operating Leases, Total Future Minimum Lease Payments	1,161.7	1,161.7
Imputed Interest on Operating Leases	131.8	131.8
Estimated Present Value of Future Minimum Lease Payments on Operating Leases	1,029.9	1,029.9
Finance Lease Future Minimum Lease Payments
Finance Leases, 2019				70.8
Finance Leases, 2020				60.2
Finance Leases, 2021				51.7
Finance Leases, 2022				43.8
Finance Leases, 2023				35.5
Finance Leases, Later Years				90.2
Finance Leases, Total Future Minimum Payments Due				352.2
Estimated Interest Element on Finance Leases				63.2
Estimated Present Value of Future Minimum Lease Payments on Finance Leases				289.0
Operating Lease Future Minimum Lease Payments
Noncancelable Operating Leases, 2019				259.6
Noncancelable Operating Leases, 2020				250.1
Noncancelable Operating Leases, 2021				232.7
Noncancelable Operating Leases, 2022				222.5
Noncancelable Operating Leases, 2023				58.3
Noncancelable Operating Leases, Later Years				165.2
Noncancelable Operating Leases Total Future Minimum Lease Payments				1,188.4
Maximum Potential Loss
Max Potential Loss on Master Lease Agreements	46.6	46.6
Rockport Lease [Member]
Future Minimum Rentals, Sale Leaseback Transactions
2019	74.2	74.2
2020	147.8	147.8
2021	147.8	147.8
2022	147.2	147.2
Total Future Minimum Lease Payments	517.0	517.0
Leases (Textuals)
Sale and Leaseback Transaction, Gain (Loss), Net		$ 37.0
Lease Term		33 years
Boat and Barge Leases [Member]
Leases (Textuals)
Maximum Potential Lease Payments, AEPRO Barge and Boat Leases	56.0	$ 56.0
Guarantor Obligations, Current Carrying Value	4.0	4.0
Guarantee Obligations Current Carrying Value Other Liabilities Current	1.0	1.0
Guarantee Obligations Current Carrying Value Other Liabilities Noncurrent	3.0	3.0
Finance Lease Assets [Member]
Property, Plant and Equipment and Other Related Obligations Under Finance Leases
Generation	134.9	134.9
Other Property, Plant and Equipment	335.9	335.9
Total Property, Plant and Equipment	470.8	470.8
Accumulated Amortization	162.7	162.7
Finance Lease Liabilities [Member]
Property, Plant and Equipment and Other Related Obligations Under Finance Leases
Obligations Under Finance Leases Noncurrent	254.0	254.0
Finance Lease Liability Due Within One Year	61.4	61.4
AEP Texas Inc. [Member]
Lease Rental Costs
Operating Lease, Cost	4.0	12.2
Finance Lease Right-of-Use Asset Amortization	1.5	3.8
Interest Expense on Finance Leases	0.3	1.0
Total Lease Rental Costs	$ 5.8	$ 17.0
Supplemental Information Related to Leases
Weighted-Average Remaining Lease Term, Operating Leases	7 years 18 days	7 years 18 days
Weighted Average Remaining Lease Term, Finance Leases	6 years 10 months 9 days	6 years 10 months 9 days
Weighted Average Discount Rate, Operating Leases	3.79%	3.79%
Weighted Average Discount Rate, Finance Leases	4.71%	4.71%
Operating Cash Flows Used for Operating Leases		$ 11.4
Operating Cash Flows Used for Finance Leases		1.0
Financing Cash Flows Used for Finance Leases		3.8	3.6
Non-cash Acquisitions Under Operating Leases		12.7
Property, Plant and Equipment and Other Related Obligations Under Finance Leases
Generation	$ 351.8	351.8		352.1
Other Property, Plant and Equipment	775.3	775.3		727.9
Total Property, Plant and Equipment	10,330.5	10,330.5		9,643.0
Accumulated Amortization	1,742.7	1,742.7		1,651.2
Net Property, Plant and Equipment Under Finance Leases	31.0	31.0
Obligations Under Finance Leases Noncurrent	137.1	137.1		104.0
Finance Lease Liability Due Within One Year	85.1	85.1		98.3
Total Obligations Under Finance Leases	31.0	31.0
Operating Lease Asset and Related Obligations
Operating Lease Assets, Noncurrent	1,119.6	1,119.6		1,135.4
Operating Lease Noncurrent Liability	71.1	71.1		0.0
Operating Lease Liability Due Within One Year	11.7	11.7		0.0
Estimated Present Value of Future Minimum Lease Payments on Operating Leases	82.8	82.8
Finance Lease Liabilities Rolling Future Minimum Lease Payments
Finance Leases, Year 1	6.6	6.6
Finance Leases, Year 2	6.1	6.1
Finance Leases, Year 3	5.3	5.3
Finance Leases, Year 4	4.9	4.9
Finance Leases, Year 5	4.1	4.1
Finance Leases, Later Years	9.8	9.8
Finance Leases, Total Future Minimum Lease Payments	36.8	36.8
Imputed Interest on Finance Leases	5.8	5.8
Total Obligations Under Finance Leases	31.0	31.0
Operating Lease Liabilities Rolling Future Minimum Lease Payments
Operating Leases, Year 1	15.7	15.7
Operating Leases, Year 2	15.2	15.2
Operating Leases, Year 3	14.1	14.1
Operating Leases, Year 4	13.0	13.0
Operating Leases, Year 5	11.4	11.4
Operating Leases, Later Years	27.8	27.8
Operating Leases, Total Future Minimum Lease Payments	97.2	97.2
Imputed Interest on Operating Leases	14.4	14.4
Estimated Present Value of Future Minimum Lease Payments on Operating Leases	82.8	82.8
Finance Lease Future Minimum Lease Payments
Finance Leases, 2019				5.8
Finance Leases, 2020				5.3
Finance Leases, 2021				4.7
Finance Leases, 2022				4.2
Finance Leases, 2023				3.7
Finance Leases, Later Years				10.1
Finance Leases, Total Future Minimum Payments Due				33.8
Estimated Interest Element on Finance Leases				5.3
Estimated Present Value of Future Minimum Lease Payments on Finance Leases				28.5
Operating Lease Future Minimum Lease Payments
Noncancelable Operating Leases, 2019				15.1
Noncancelable Operating Leases, 2020				14.1
Noncancelable Operating Leases, 2021				13.2
Noncancelable Operating Leases, 2022				12.2
Noncancelable Operating Leases, 2023				10.8
Noncancelable Operating Leases, Later Years				28.4
Noncancelable Operating Leases Total Future Minimum Lease Payments				93.8
Maximum Potential Loss
Max Potential Loss on Master Lease Agreements	11.2	11.2
AEP Texas Inc. [Member] \| Finance Lease Assets [Member]
Property, Plant and Equipment and Other Related Obligations Under Finance Leases
Generation	0.0	0.0
Other Property, Plant and Equipment	41.9	41.9
Total Property, Plant and Equipment	41.9	41.9
Accumulated Amortization	10.9	10.9
AEP Texas Inc. [Member] \| Finance Lease Liabilities [Member]
Property, Plant and Equipment and Other Related Obligations Under Finance Leases
Obligations Under Finance Leases Noncurrent	25.8	25.8
Finance Lease Liability Due Within One Year	5.2	5.2
AEP Texas Inc. [Member] \| Operating Lease Assets [Member]
Operating Lease Asset and Related Obligations
Operating Lease Assets, Noncurrent	82.0	82.0
AEP Transmission Co [Member]
Lease Rental Costs
Operating Lease, Cost	0.6	1.7
Finance Lease Right-of-Use Asset Amortization	0.1	0.1
Interest Expense on Finance Leases	0.0	0.0
Total Lease Rental Costs	$ 0.7	$ 1.8
Supplemental Information Related to Leases
Weighted-Average Remaining Lease Term, Operating Leases	2 years 5 months 4 days	2 years 5 months 4 days
Weighted Average Remaining Lease Term, Finance Leases	17 days	17 days
Weighted Average Discount Rate, Operating Leases	3.13%	3.13%
Weighted Average Discount Rate, Finance Leases	9.33%	9.33%
Operating Cash Flows Used for Operating Leases		$ 1.7
Operating Cash Flows Used for Finance Leases		0.0
Financing Cash Flows Used for Finance Leases		0.0
Non-cash Acquisitions Under Operating Leases		0.0
Property, Plant and Equipment and Other Related Obligations Under Finance Leases
Other Property, Plant and Equipment	$ 227.2	227.2		174.0
Total Property, Plant and Equipment	9,267.4	9,267.4		8,268.1
Accumulated Amortization	368.8	368.8		271.9
Net Property, Plant and Equipment Under Finance Leases	0.0	0.0
Obligations Under Finance Leases Noncurrent	3.1	3.1		18.4
Finance Lease Liability Due Within One Year	25.5	25.5		3.8
Total Obligations Under Finance Leases	0.0	0.0
Operating Lease Asset and Related Obligations
Operating Lease Assets, Noncurrent	64.9	64.9		172.4
Operating Lease Noncurrent Liability	2.2	2.2		0.0
Operating Lease Liability Due Within One Year	2.3	2.3		0.0
Estimated Present Value of Future Minimum Lease Payments on Operating Leases	4.5	4.5
Finance Lease Liabilities Rolling Future Minimum Lease Payments
Finance Leases, Year 1	0.0	0.0
Finance Leases, Year 2	0.0	0.0
Finance Leases, Year 3	0.0	0.0
Finance Leases, Year 4	0.0	0.0
Finance Leases, Year 5	0.0	0.0
Finance Leases, Later Years	0.0	0.0
Finance Leases, Total Future Minimum Lease Payments	0.0	0.0
Imputed Interest on Finance Leases	0.0	0.0
Total Obligations Under Finance Leases	0.0	0.0
Operating Lease Liabilities Rolling Future Minimum Lease Payments
Operating Leases, Year 1	2.4	2.4
Operating Leases, Year 2	1.5	1.5
Operating Leases, Year 3	0.7	0.7
Operating Leases, Year 4	0.3	0.3
Operating Leases, Year 5	0.0	0.0
Operating Leases, Later Years	0.0	0.0
Operating Leases, Total Future Minimum Lease Payments	4.9	4.9
Imputed Interest on Operating Leases	0.4	0.4
Estimated Present Value of Future Minimum Lease Payments on Operating Leases	4.5	4.5
Finance Lease Future Minimum Lease Payments
Finance Leases, 2019				0.1
Finance Leases, 2020				0.0
Finance Leases, 2021				0.0
Finance Leases, 2022				0.0
Finance Leases, 2023				0.0
Finance Leases, Later Years				0.0
Finance Leases, Total Future Minimum Payments Due				0.1
Estimated Interest Element on Finance Leases				0.0
Estimated Present Value of Future Minimum Lease Payments on Finance Leases				0.1
Operating Lease Future Minimum Lease Payments
Noncancelable Operating Leases, 2019				2.3
Noncancelable Operating Leases, 2020				1.8
Noncancelable Operating Leases, 2021				1.0
Noncancelable Operating Leases, 2022				0.5
Noncancelable Operating Leases, 2023				0.1
Noncancelable Operating Leases, Later Years				0.0
Noncancelable Operating Leases Total Future Minimum Lease Payments				5.7
AEP Transmission Co [Member] \| Finance Lease Assets [Member]
Property, Plant and Equipment and Other Related Obligations Under Finance Leases
Generation	0.0	0.0
Other Property, Plant and Equipment	0.2	0.2
Total Property, Plant and Equipment	0.2	0.2
Accumulated Amortization	0.2	0.2
AEP Transmission Co [Member] \| Finance Lease Liabilities [Member]
Property, Plant and Equipment and Other Related Obligations Under Finance Leases
Obligations Under Finance Leases Noncurrent	0.0	0.0
Finance Lease Liability Due Within One Year	0.0	0.0
AEP Transmission Co [Member] \| Operating Lease Assets [Member]
Operating Lease Asset and Related Obligations
Operating Lease Assets, Noncurrent	4.6	4.6
Appalachian Power Co [Member]
Lease Rental Costs
Operating Lease, Cost	4.9	14.5
Finance Lease Right-of-Use Asset Amortization	2.0	5.0
Interest Expense on Finance Leases	0.8	2.2
Total Lease Rental Costs	$ 7.7	$ 21.7
Supplemental Information Related to Leases
Weighted-Average Remaining Lease Term, Operating Leases	6 years 3 months	6 years 3 months
Weighted Average Remaining Lease Term, Finance Leases	6 years 3 months 29 days	6 years 3 months 29 days
Weighted Average Discount Rate, Operating Leases	3.67%	3.67%
Weighted Average Discount Rate, Finance Leases	8.19%	8.19%
Operating Cash Flows Used for Operating Leases		$ 14.1
Operating Cash Flows Used for Finance Leases		2.2
Financing Cash Flows Used for Finance Leases		5.0	5.2
Non-cash Acquisitions Under Operating Leases		8.6
Property, Plant and Equipment and Other Related Obligations Under Finance Leases
Generation	$ 6,560.5	6,560.5		6,509.6
Other Property, Plant and Equipment	525.3	525.3		485.8
Total Property, Plant and Equipment	15,292.3	15,292.3		14,792.7
Accumulated Amortization	4,300.2	4,300.2		4,124.4
Net Property, Plant and Equipment Under Finance Leases	41.9	41.9
Obligations Under Finance Leases Noncurrent	57.5	57.5		58.6
Finance Lease Liability Due Within One Year	107.6	107.6		150.3
Total Obligations Under Finance Leases	41.9	41.9
Operating Lease Asset and Related Obligations
Operating Lease Assets	79.4	79.4		0.0
Operating Lease Assets, Noncurrent	953.7	953.7		923.5
Operating Lease Noncurrent Liability	64.8	64.8		0.0
Operating Lease Liability Due Within One Year	15.3	15.3		0.0
Estimated Present Value of Future Minimum Lease Payments on Operating Leases	80.1	80.1
Finance Lease Liabilities Rolling Future Minimum Lease Payments
Finance Leases, Year 1	9.6	9.6
Finance Leases, Year 2	8.8	8.8
Finance Leases, Year 3	8.1	8.1
Finance Leases, Year 4	7.5	7.5
Finance Leases, Year 5	7.0	7.0
Finance Leases, Later Years	11.3	11.3
Finance Leases, Total Future Minimum Lease Payments	52.3	52.3
Imputed Interest on Finance Leases	10.4	10.4
Total Obligations Under Finance Leases	41.9	41.9
Operating Lease Liabilities Rolling Future Minimum Lease Payments
Operating Leases, Year 1	18.4	18.4
Operating Leases, Year 2	16.4	16.4
Operating Leases, Year 3	14.7	14.7
Operating Leases, Year 4	12.5	12.5
Operating Leases, Year 5	9.8	9.8
Operating Leases, Later Years	20.1	20.1
Operating Leases, Total Future Minimum Lease Payments	91.9	91.9
Imputed Interest on Operating Leases	11.8	11.8
Estimated Present Value of Future Minimum Lease Payments on Operating Leases	80.1	80.1
Finance Lease Future Minimum Lease Payments
Finance Leases, 2019				9.0
Finance Leases, 2020				8.0
Finance Leases, 2021				7.3
Finance Leases, 2022				6.8
Finance Leases, 2023				6.3
Finance Leases, Later Years				13.3
Finance Leases, Total Future Minimum Payments Due				50.7
Estimated Interest Element on Finance Leases				10.9
Estimated Present Value of Future Minimum Lease Payments on Finance Leases				39.8
Operating Lease Future Minimum Lease Payments
Noncancelable Operating Leases, 2019				17.6
Noncancelable Operating Leases, 2020				16.5
Noncancelable Operating Leases, 2021				13.9
Noncancelable Operating Leases, 2022				12.8
Noncancelable Operating Leases, 2023				9.9
Noncancelable Operating Leases, Later Years				20.5
Noncancelable Operating Leases Total Future Minimum Lease Payments				91.2
Maximum Potential Loss
Max Potential Loss on Master Lease Agreements	6.3	6.3
Appalachian Power Co [Member] \| Finance Lease Assets [Member]
Property, Plant and Equipment and Other Related Obligations Under Finance Leases
Generation	41.3	41.3
Other Property, Plant and Equipment	18.4	18.4
Total Property, Plant and Equipment	59.7	59.7
Accumulated Amortization	17.8	17.8
Appalachian Power Co [Member] \| Finance Lease Liabilities [Member]
Property, Plant and Equipment and Other Related Obligations Under Finance Leases
Obligations Under Finance Leases Noncurrent	35.2	35.2
Finance Lease Liability Due Within One Year	6.7	6.7
Indiana Michigan Power Co [Member]
Lease Rental Costs
Operating Lease, Cost	23.7	70.0
Finance Lease Right-of-Use Asset Amortization	1.6	4.2
Interest Expense on Finance Leases	0.8	2.3
Total Lease Rental Costs	$ 26.1	$ 76.5
Supplemental Information Related to Leases
Weighted-Average Remaining Lease Term, Operating Leases	4 years 18 days	4 years 18 days
Weighted Average Remaining Lease Term, Finance Leases	6 years 8 months 19 days	6 years 8 months 19 days
Weighted Average Discount Rate, Operating Leases	3.45%	3.45%
Weighted Average Discount Rate, Finance Leases	8.61%	8.61%
Operating Cash Flows Used for Operating Leases		$ 52.5
Operating Cash Flows Used for Finance Leases		2.2
Financing Cash Flows Used for Finance Leases		4.0	7.3
Non-cash Acquisitions Under Operating Leases		16.6
Property, Plant and Equipment and Other Related Obligations Under Finance Leases
Generation	$ 5,002.0	5,002.0		4,887.2
Other Property, Plant and Equipment	607.2	607.2		583.8
Total Property, Plant and Equipment	10,113.2	10,113.2		9,762.8
Accumulated Amortization	3,280.5	3,280.5		3,151.6
Net Property, Plant and Equipment Under Finance Leases	42.8	42.8
Obligations Under Finance Leases Noncurrent	65.6	65.6		87.8
Finance Lease Liability Due Within One Year	85.5	85.5		103.0
Total Obligations Under Finance Leases	43.1	43.1
Operating Lease Asset and Related Obligations
Operating Lease Assets	295.3	295.3		0.0
Operating Lease Assets, Noncurrent	3,750.4	3,750.4		3,181.0
Operating Lease Noncurrent Liability	234.0	234.0		0.0
Operating Lease Liability Due Within One Year	82.0	82.0		0.0
Estimated Present Value of Future Minimum Lease Payments on Operating Leases	316.0	316.0
Finance Lease Liabilities Rolling Future Minimum Lease Payments
Finance Leases, Year 1	9.0	9.0
Finance Leases, Year 2	8.2	8.2
Finance Leases, Year 3	7.6	7.6
Finance Leases, Year 4	7.1	7.1
Finance Leases, Year 5	6.7	6.7
Finance Leases, Later Years	20.9	20.9
Finance Leases, Total Future Minimum Lease Payments	59.5	59.5
Imputed Interest on Finance Leases	16.4	16.4
Total Obligations Under Finance Leases	43.1	43.1
Operating Lease Liabilities Rolling Future Minimum Lease Payments
Operating Leases, Year 1	92.2	92.2
Operating Leases, Year 2	88.4	88.4
Operating Leases, Year 3	86.3	86.3
Operating Leases, Year 4	48.0	48.0
Operating Leases, Year 5	7.3	7.3
Operating Leases, Later Years	22.0	22.0
Operating Leases, Total Future Minimum Lease Payments	344.2	344.2
Imputed Interest on Operating Leases	28.2	28.2
Estimated Present Value of Future Minimum Lease Payments on Operating Leases	316.0	316.0
Finance Lease Future Minimum Lease Payments
Finance Leases, 2019				8.2
Finance Leases, 2020				7.2
Finance Leases, 2021				6.6
Finance Leases, 2022				6.1
Finance Leases, 2023				5.7
Finance Leases, Later Years				21.7
Finance Leases, Total Future Minimum Payments Due				55.5
Estimated Interest Element on Finance Leases				16.8
Estimated Present Value of Future Minimum Lease Payments on Finance Leases				38.7
Operating Lease Future Minimum Lease Payments
Noncancelable Operating Leases, 2019				92.6
Noncancelable Operating Leases, 2020				89.3
Noncancelable Operating Leases, 2021				84.8
Noncancelable Operating Leases, 2022				83.8
Noncancelable Operating Leases, 2023				6.5
Noncancelable Operating Leases, Later Years				19.5
Noncancelable Operating Leases Total Future Minimum Lease Payments				376.5
Maximum Potential Loss
Max Potential Loss on Master Lease Agreements	4.0	4.0
Indiana Michigan Power Co [Member] \| Rockport Lease [Member]
Future Minimum Rentals, Sale Leaseback Transactions
2019	37.1	37.1
2020	73.9	73.9
2021	73.9	73.9
2022	73.6	73.6
Total Future Minimum Lease Payments	258.5	258.5
Leases (Textuals)
Sale and Leaseback Transaction, Gain (Loss), Net		$ 15.0
Lease Term		33 years
Indiana Michigan Power Co [Member] \| Finance Lease Assets [Member]
Property, Plant and Equipment and Other Related Obligations Under Finance Leases
Generation	28.5	$ 28.5
Other Property, Plant and Equipment	37.1	37.1
Total Property, Plant and Equipment	65.6	65.6
Accumulated Amortization	22.8	22.8
Indiana Michigan Power Co [Member] \| Finance Lease Liabilities [Member]
Property, Plant and Equipment and Other Related Obligations Under Finance Leases
Obligations Under Finance Leases Noncurrent	37.1	37.1
Finance Lease Liability Due Within One Year	6.0	6.0
Ohio Power Co [Member]
Lease Rental Costs
Operating Lease, Cost	4.9	13.8
Finance Lease Right-of-Use Asset Amortization	1.1	2.6
Interest Expense on Finance Leases	0.2	0.5
Total Lease Rental Costs	$ 6.2	$ 16.9
Supplemental Information Related to Leases
Weighted-Average Remaining Lease Term, Operating Leases	8 years 1 month 6 days	8 years 1 month 6 days
Weighted Average Remaining Lease Term, Finance Leases	6 years 6 months 29 days	6 years 6 months 29 days
Weighted Average Discount Rate, Operating Leases	3.79%	3.79%
Weighted Average Discount Rate, Finance Leases	4.66%	4.66%
Operating Cash Flows Used for Operating Leases		$ 13.8
Operating Cash Flows Used for Finance Leases		0.5
Financing Cash Flows Used for Finance Leases		2.6	2.9
Non-cash Acquisitions Under Operating Leases		34.6
Property, Plant and Equipment and Other Related Obligations Under Finance Leases
Other Property, Plant and Equipment	$ 662.3	662.3		574.8
Total Property, Plant and Equipment	8,953.4	8,953.4		8,493.5
Accumulated Amortization	2,256.1	2,256.1		2,218.6
Net Property, Plant and Equipment Under Finance Leases	18.1	18.1
Obligations Under Finance Leases Noncurrent	49.9	49.9		43.8
Finance Lease Liability Due Within One Year	99.4	99.4		182.8
Total Obligations Under Finance Leases	18.1	18.1
Operating Lease Asset and Related Obligations
Operating Lease Assets, Noncurrent	692.5	692.5		841.4
Operating Lease Noncurrent Liability	75.9	75.9		0.0
Operating Lease Liability Due Within One Year	12.8	12.8		0.0
Estimated Present Value of Future Minimum Lease Payments on Operating Leases	88.7	88.7
Finance Lease Liabilities Rolling Future Minimum Lease Payments
Finance Leases, Year 1	4.3	4.3
Finance Leases, Year 2	3.9	3.9
Finance Leases, Year 3	3.2	3.2
Finance Leases, Year 4	2.5	2.5
Finance Leases, Year 5	2.1	2.1
Finance Leases, Later Years	5.3	5.3
Finance Leases, Total Future Minimum Lease Payments	21.3	21.3
Imputed Interest on Finance Leases	3.2	3.2
Total Obligations Under Finance Leases	18.1	18.1
Operating Lease Liabilities Rolling Future Minimum Lease Payments
Operating Leases, Year 1	16.6	16.6
Operating Leases, Year 2	13.9	13.9
Operating Leases, Year 3	13.3	13.3
Operating Leases, Year 4	12.4	12.4
Operating Leases, Year 5	10.8	10.8
Operating Leases, Later Years	38.3	38.3
Operating Leases, Total Future Minimum Lease Payments	105.3	105.3
Imputed Interest on Operating Leases	16.6	16.6
Estimated Present Value of Future Minimum Lease Payments on Operating Leases	88.7	88.7
Finance Lease Future Minimum Lease Payments
Finance Leases, 2019				3.3
Finance Leases, 2020				2.7
Finance Leases, 2021				2.3
Finance Leases, 2022				1.7
Finance Leases, 2023				1.2
Finance Leases, Later Years				2.8
Finance Leases, Total Future Minimum Payments Due				14.0
Estimated Interest Element on Finance Leases				1.9
Estimated Present Value of Future Minimum Lease Payments on Finance Leases				12.1
Operating Lease Future Minimum Lease Payments
Noncancelable Operating Leases, 2019				14.5
Noncancelable Operating Leases, 2020				13.2
Noncancelable Operating Leases, 2021				10.9
Noncancelable Operating Leases, 2022				10.0
Noncancelable Operating Leases, 2023				8.8
Noncancelable Operating Leases, Later Years				31.7
Noncancelable Operating Leases Total Future Minimum Lease Payments				89.1
Maximum Potential Loss
Max Potential Loss on Master Lease Agreements	7.4	7.4
Ohio Power Co [Member] \| Finance Lease Assets [Member]
Property, Plant and Equipment and Other Related Obligations Under Finance Leases
Generation	0.0	0.0
Other Property, Plant and Equipment	24.7	24.7
Total Property, Plant and Equipment	24.7	24.7

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The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees recorded under Other Current Liabilities.

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The term of the lease.

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Non-cash Acquisitions Under Operating Leases

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Supplemental Information Related to Leases

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Present value of lessee's discounted obligation for lease payments from finance lease.

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