Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Current assets
Cash and cash equivalents	$ 23.8	$ 25.4
Receivables, less allowance for uncollectibles	280.7	299.8
Inventories, at average cost
Regulatory assets	44.8	53.6
Deferred income taxes	0.0	72.8
Prepayments and other current assets	30.8	22.6
Assets held for sale	0.0	109.6
Total current assets	570.3	755.6
Property, plant and equipment
Construction work in progress	794.7	640.0
Other property	15.9	14.5
Property, plant and equipment, at original costs	10,194.7	9,733.9
Accumulated depreciation	(2,712.9)	(2,645.7)
Total property, plant and equipment, net	7,481.8	7,088.2
Other assets
Regulatory assets	395.2	348.5
Goodwill	408.4	408.3
Deferred charges and other assets	105.4	65.8
Assets held for sale	0.0	59.8
Total other assets	909.0	882.4
Total assets	8,961.1	8,726.2
Current liabilities
Long-term debt due within one year	333.3	274.5
Notes payable	247.0	139.0
Accounts payable	255.4	288.6
Customer deposits	182.1	176.2
Regulatory liabilities	84.8	57.0
Derivative liabilities	24.1	36.6
Interest accrued	36.2	39.9
Taxes accrued	13.2	29.9
Other	22.6	16.8
Liabilities associated with assets held for sale	0.0	39.4
Total current liabilities	1,198.7	1,097.9
Other liabilities
Deferred income taxes	570.7	519.2
Investment tax credits	10.5	9.0
Regulatory liabilities	715.8	729.0
Derivative liabilities	2.1	6.1
Deferred credits and other liabilities	387.4	370.9
Liabilities associated with assets held for sale	0.0	65.4
Long-term debt, less amount due within one year	3,516.9	3,354.0
Total other liabilities	$ 5,203.4	$ 5,053.6
Commitments and Contingencies
Capital
Common equity	$ 235.3	$ 234.9
Additional paid in capital	1,894.5	1,875.9
Retained earnings	441.4	479.6
Accumulated other comprehensive loss	(12.2)	(15.7)
Total capital	2,559.0	2,574.7
Total liabilities and capital	8,961.1	8,726.2
Long-term debt, less amount due within one year	3,516.9	3,354.0
Tampa Electric Company [Member]
Current assets
Cash and cash equivalents	9.1	10.4
Receivables, less allowance for uncollectibles	230.2	227.2
Inventories, at average cost
Taxes receivable from affiliate	61.3	43.3
Regulatory assets	44.3	52.1
Deferred income taxes	0.0	24.8
Prepayments and other current assets	21.5	17.4
Total current assets	545.1	532.6
Property, plant and equipment
Construction work in progress	771.1	624.2
Utility plant in service, at original costs	9,440.0	9,027.9
Accumulated depreciation	(2,676.8)	(2,633.8)
Utility plant in service, net	6,763.2	6,394.1
Other property	9.7	8.6
Total property, plant and equipment, net	6,772.9	6,402.7
Other assets
Unamortized debt expense	18.1	16.8
Regulatory assets	373.8	319.6
Deferred charges and other assets	408.7	339.0
Other	16.8	2.6
Total assets	7,726.7	7,274.3
Current liabilities
Long-term debt due within one year	83.3	83.3
Notes payable	61.0	58.0
Accounts payable	221.6	242.3
Customer deposits	176.3	170.4
Regulatory liabilities	83.2	54.7
Derivative liabilities	24.1	36.6
Interest accrued	16.9	17.0
Taxes accrued	13.2	12.4
Other	10.2	10.0
Total current liabilities	689.8	684.7
Other liabilities
Deferred income taxes	1,308.8	1,209.1
Investment tax credits	10.5	9.0
Regulatory liabilities	603.5	623.4
Derivative liabilities	2.1	6.1
Deferred credits and other liabilities	316.7	299.1
Long-term debt, less amount due within one year	2,179.8	2,013.8
Total deferred credits	$ 2,241.6	$ 2,146.7
Commitments and Contingencies
Capital
Common equity	$ 2,305.4	$ 2,130.4
Retained earnings	313.7	305.8
Accumulated other comprehensive loss	(3.6)	(7.1)
Total capital	2,615.5	2,429.1
Total liabilities and capital	7,726.7	7,274.3
Long-term debt, less amount due within one year	2,179.8	2,013.8
Total capital	4,795.3	4,442.9
Fuel [Member]
Inventories, at average cost
Utility inventories	113.4	96.4
Fuel [Member] | Tampa Electric Company [Member]
Inventories, at average cost
Utility inventories	105.6	85.2
Materials and Supplies [Member]
Inventories, at average cost
Utility inventories	76.8	75.4
Materials and Supplies [Member] | Tampa Electric Company [Member]
Inventories, at average cost
Utility inventories	73.1	72.2
Electric [Member]
Property, plant and equipment
Utility plant in service, at original costs	7,270.3	7,094.8
Electric [Member] | Tampa Electric Company [Member]
Property, plant and equipment
Utility plant in service, at original costs	7,270.3	7,094.8
Gas [Member]
Property, plant and equipment
Utility plant in service, at original costs	2,113.8	1,984.6
Gas [Member] | Tampa Electric Company [Member]
Property, plant and equipment
Utility plant in service, at original costs	$ 1,398.6	$ 1,308.9