Consolidated Condensed Balance Sheets (Unaudited) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents	$ 46.1	$ 23.8
Receivables, less allowance for uncollectibles	240.1	280.7
Inventories, at average cost
Regulatory assets	40.2	44.8
Prepayments and other current assets	25.4	30.8
Total current assets	547.2	570.3
Property, plant and equipment
Construction work in progress	816.9	794.7
Other property	16.1	15.9
Property, plant and equipment, at original costs	10,315.4	10,194.7
Accumulated depreciation	(2,762.4)	(2,712.9)
Total property, plant and equipment, net	7,553.0	7,481.8
Other assets
Regulatory assets	393.4	395.2
Goodwill	408.4	408.4
Deferred charges and other assets	79.1	77.8
Total other assets	880.9	881.4
Total assets	8,981.1	8,933.5
Current liabilities
Long-term debt due within one year	83.3	333.3
Notes payable	513.0	247.0
Accounts payable	189.5	255.4
Customer deposits	176.7	182.1
Regulatory liabilities	108.4	84.8
Derivative liabilities	22.3	24.1
Interest accrued	54.0	36.2
Taxes accrued	28.2	13.2
Other	25.2	22.6
Total current liabilities	1,200.6	1,198.7
Other liabilities
Deferred income taxes	607.0	570.7
Investment tax credits	10.4	10.5
Regulatory liabilities	709.4	715.8
Derivative liabilities	0.8	2.1
Deferred credits and other liabilities	380.9	387.5
Long-term debt, less amount due within one year	3,489.7	3,489.2
Total other liabilities	$ 5,198.2	$ 5,175.8
Commitments and contingencies
Capital
Common equity	$ 235.5	$ 235.3
Additional paid in capital	1,894.8	1,894.5
Retained earnings	463.5	441.4
Accumulated other comprehensive loss	(11.5)	(12.2)
Total capital	2,582.3	2,559.0
Long-term debt	3,489.7	3,489.2
Total liabilities and capital	8,981.1	8,933.5
Tampa Electric Company [Member]
Current assets
Cash and cash equivalents	28.2	9.1
Receivables, less allowance for uncollectibles	205.5	230.2
Inventories, at average cost
Taxes receivable from affiliate	0.0	61.3
Regulatory assets	39.9	44.3
Prepayments and other current assets	17.0	21.5
Total current assets	479.6	545.1
Property, plant and equipment
Construction work in progress	797.0	771.1
Utility plant in service, at original costs	9,544.6	9,440.0
Accumulated depreciation	(2,720.3)	(2,676.8)
Utility plant in service, net	6,824.3	6,763.2
Other property	9.9	9.7
Total property, plant and equipment, net	6,834.2	6,772.9
Other assets
Regulatory assets	373.1	373.8
Deferred charges and other assets	391.0	390.6
Other	17.9	16.8
Total assets	7,704.8	7,708.6
Current liabilities
Long-term debt due within one year	83.3	83.3
Notes payable	0.0	61.0
Accounts payable	174.6	221.6
Customer deposits	170.9	176.3
Regulatory liabilities	104.5	83.2
Derivative liabilities	22.2	24.1
Interest accrued	41.2	16.9
Taxes accrued	33.6	13.2
Other	10.1	10.2
Total current liabilities	640.4	689.8
Other liabilities
Deferred income taxes	1,342.0	1,308.8
Investment tax credits	10.4	10.5
Regulatory liabilities	595.5	603.5
Derivative liabilities	0.8	2.1
Deferred credits and other liabilities	312.3	316.7
Long-term debt, less amount due within one year	2,162.0	2,161.7
Total deferred credits	$ 2,261.0	$ 2,241.6
Commitments and contingencies
Capital
Common equity	$ 2,330.4	$ 2,305.4
Retained earnings	314.4	313.7
Accumulated other comprehensive loss	(3.4)	(3.6)
Total capital	2,641.4	2,615.5
Long-term debt	2,162.0	2,161.7
Total capitalization	4,803.4	4,777.2
Total liabilities and capital	7,704.8	7,708.6
Fuel [Member]
Inventories, at average cost
Utility inventories	118.3	113.4
Fuel [Member] | Tampa Electric Company [Member]
Inventories, at average cost
Utility inventories	115.4	105.6
Materials and Supplies [Member]
Inventories, at average cost
Utility inventories	77.1	76.8
Materials and Supplies [Member] | Tampa Electric Company [Member]
Inventories, at average cost
Utility inventories	73.6	73.1
Electric [Member]
Property, plant and equipment
Utility plant in service, at original costs	7,328.3	7,270.3
Electric [Member] | Tampa Electric Company [Member]
Property, plant and equipment
Utility plant in service, at original costs	7,328.3	7,270.3
Gas [Member]
Property, plant and equipment
Utility plant in service, at original costs	2,154.1	2,113.8
Gas [Member] | Tampa Electric Company [Member]
Property, plant and equipment
Utility plant in service, at original costs	$ 1,419.3	$ 1,398.6