Consolidated Condensed Balance Sheets (Unaudited) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 72.7	$ 185.2
Receivables, less allowance for uncollectibles	293.0	287.2
Inventories, at average cost
Derivative assets	0.2	9.7
Regulatory assets	24.3	34.3
Deferred income taxes	93.6	100.3
Prepayments and other current assets	29.6	34.9
Income tax receivables	0.8	1.5
Assets held for sale	133.7	0
Total current assets	815.2	857.7
Property, plant and equipment
Construction work in progress	545.7	386.7
Other property	14.3	448.3
Property, plant and equipment, at original costs	9,540.4	9,077.3
Accumulated depreciation	(2,588.0)	(2,907.2)
Total property, plant and equipment, net	6,952.4	6,170.1
Other assets
Regulatory assets	342.2	293.1
Goodwill	401.8	0
Derivative assets	0	0.3
Deferred charges and other assets	63.4	126.8
Assets held for sale	78.6	0
Total other assets	886.0	420.2
Total assets	8,653.6	7,448.0
Current liabilities
Long-term debt due within one year	274.5	83.3
Notes payable	72.0	84.0
Accounts payable	231.4	261.7
Customer deposits	174.9	164.5
Regulatory liabilities	65.8	85.8
Derivative liabilities	4.1	0.1
Interest accrued	60.3	31.9
Taxes accrued	76.6	34.6
Other	17.6	19.5
Liabilities associated with assets held for sale	41.1	0
Total current liabilities	1,018.3	765.4
Other liabilities
Deferred income taxes	510.8	444.0
Investment tax credits	9.1	9.4
Regulatory liabilities	727.2	631.4
Derivative liabilities	1.6	0.2
Deferred credits and other liabilities	364.6	426.1
Liabilities associated with assets held for sale	64.4	0
Long-term debt, less amount due within one year	3,354.8	2,837.8
Total other liabilities	5,032.5	4,348.9
Commitments and contingencies (see Note 10)
Capital
Common equity	234.6	217.3
Additional paid in capital	1,867.9	1,581.3
Retained earnings	520.4	548.3
Accumulated other comprehensive loss	(20.1)	(13.2)
Total capital	2,602.8	2,333.7
Long-term debt	3,354.8	2,837.8
Total liabilities and capital	8,653.6	7,448.0
Tampa Electric Company [Member]
Current assets
Cash and cash equivalents	59.1	9.8
Receivables, less allowance for uncollectibles	266.8	227.6
Inventories, at average cost
Derivative assets	0.1	9.5
Regulatory assets	22.9	34.3
Deferred income taxes	23.8	29.4
Prepayments and other current assets	24.9	12.5
Income tax receivables	0	54.9
Total current assets	550.1	548.5
Property, plant and equipment
Construction work in progress	528.2	385.3
Property, plant and equipment, at original costs	8,844.8	8,568.8
Accumulated depreciation	(2,582.1)	(2,562.6)
Total property, plant and equipment, net	6,271.1	6,014.5
Public Utilities, Property, Plant and Equipment, Net	6,262.7	6,006.2
Other property	8.4	8.3
Other assets
Regulatory assets	311.7	293.1
Derivative assets	0	0.3
Deferred charges and other assets	333.1	312.8
Unamortized debt expense	17.1	14.8
Other	4.3	4.6
Total assets	7,154.3	6,875.8
Current liabilities
Long-term debt due within one year	83.3	83.3
Notes payable	0	84.0
Accounts payable	210.3	226.0
Customer deposits	169.2	164.5
Regulatory liabilities	64.5	85.8
Derivative liabilities	4.0	0
Interest accrued	40.7	16.4
Taxes accrued	70.6	12.2
Other	11.9	12.0
Total current liabilities	654.5	684.2
Other liabilities
Deferred income taxes	1,165.2	1,114.3
Investment tax credits	9.1	9.4
Regulatory liabilities	623.5	631.4
Derivative liabilities	1.6	0.2
Long-term debt, less amount due within one year	2,013.8	1,797.5
Total other liabilities	2,091.1	2,063.4
Other	291.7	308.1
Commitments and contingencies (see Note 10)
Capital
Common equity	2,049.9	2,030.4
Retained earnings	352.3	308.1
Accumulated other comprehensive loss	(7.3)	(7.8)
Total capital	2,394.9	2,330.7
Long-term debt	2,013.8	1,797.5
Total capitalization	4,408.7	4,128.2
Total liabilities and capital	7,154.3	6,875.8
Fuel [Member]
Inventories, at average cost
Utility inventories	92.3	118.7
Fuel [Member] | Tampa Electric Company [Member]
Inventories, at average cost
Utility inventories	80.9	93.7
Materials and Supplies [Member]
Inventories, at average cost
Utility inventories	75.0	85.9
Materials and Supplies [Member] | Tampa Electric Company [Member]
Inventories, at average cost
Utility inventories	71.6	76.8
Electric [Member]
Property, plant and equipment
Public utilities, property, plant and equipment	7,029.9	6,934.0
Electric [Member] | Tampa Electric Company [Member]
Property, plant and equipment
Public utilities, property, plant and equipment	7,029.9	6,934.0
Gas [Member]
Property, plant and equipment
Public utilities, property, plant and equipment	1,950.5	1,308.3
Gas [Member] | Tampa Electric Company [Member]
Property, plant and equipment
Public utilities, property, plant and equipment	$ 1,286.7	$ 1,249.5