Debt Instrument Maturity Year

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- Definition

Debt Instrument Principal Amount Market Price Percentage

+ Details

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- Definition

Debt Instrument Yield to Maturity

+ Details

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- Definition

Federal Funds Rate Plus Basis Points

+ Details

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- Definition

Redeemable Principal Amount Percentage

+ Details

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- Definition

The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 21
-Paragraph 16, 20
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

+ Details

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- Definition

The average effective interest rate during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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- Definition

Interest rate stated in the contractual debt agreement.

+ References

+ Details

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- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number APB14-1
-Paragraph 31
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 21
-Paragraph 16, 20
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

+ Details

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Balance Type:	debit
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- Definition

Gross amount of debt extinguished.

+ Details

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Balance Type:	debit
Period Type:	duration

- Definition

Amount represents the difference between the fair value of the payments made and the carrying amount of the debt at the time of its extinguishment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629

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-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 26
-Paragraph 20, 21
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
-Paragraph 28
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-Name Accounting Standards Codification
-Topic 470
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-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629

+ Details

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- Definition

The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

+ Details

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 18
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

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Long-Term Debt (Details) (USD $)	0 Months Ended		3 Months Ended		6 Months Ended		0 Months Ended		0 Months Ended		0 Months Ended		0 Months Ended		0 Months Ended		1 Months Ended	6 Months Ended	0 Months Ended	3 Months Ended	6 Months Ended	0 Months Ended	3 Months Ended	6 Months Ended	0 Months Ended			6 Months Ended	0 Months Ended	6 Months Ended
Long-Term Debt (Details) (USD $)	Feb. 18, 2011	Mar. 22, 2010	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Mar. 15, 2010 4.00% Notes due 2016 [Member] Teco Finance [Member]	Jun. 30, 2011 4.00% Notes due 2016 [Member] Teco Finance [Member]	Mar. 15, 2010 5.15% Notes due 2020 [Member] Teco Finance [Member]	Jun. 30, 2011 5.15% Notes due 2020 [Member] Teco Finance [Member]	Mar. 22, 2010 7.20% Notes due 2011 [Member]	Apr. 30, 2011 7.20% Notes due 2011 [Member]	Mar. 22, 2010 7.20% Notes due 2011 [Member] Teco Finance [Member]	Apr. 30, 2010 7.20% Notes due 2011 [Member] Teco Finance [Member]	Mar. 22, 2010 7.0% Notes due 2012 [Member]	Mar. 22, 2010 7.0% Notes due 2012 [Member] Teco Finance [Member]	Apr. 30, 2010 Floating Rate Notes due 2010 [Member] Teco Finance [Member]	Jun. 30, 2011 Premiums and Fees Expense [Member]	Mar. 01, 2011 Tampa Electric Co [Member] PCIDA Bonds [Member]	Mar. 01, 2011 Tampa Electric Co [Member] PCIDA Bonds [Member]	Jun. 30, 2011 Tampa Electric Co [Member] PCIDA Bonds [Member]	Mar. 01, 2011 PCIDA Bonds [Member]	Mar. 31, 2011 PCIDA Bonds [Member]	Jun. 30, 2011 PCIDA Bonds [Member]	Mar. 26, 2008 Tampa Electric Co [Member] HCIDA Bonds [Member]	Mar. 26, 2008 HCIDA Bonds [Member]	Mar. 22, 2010 Teco Finance [Member]	Jun. 30, 2011 Teco Finance [Member]	Feb. 18, 2011 Tampa Electric Co [Member]	Jun. 30, 2011 Tampa Electric Co [Member]	Jun. 30, 2010 Tampa Electric Co [Member]
Purchase in lieu of redemption					$ 144,600,000	$ 507,600,000													$ 75,000,000		$ 95,000,000	$ 75,000,000		$ 95,000,000	$ 20,000,000	$ 20,000,000				$ 75,300,000	$ 0
Aggregate principal amount issued							250,000,000			300,000,000
Debt instrument maturity year																	2010
Stated interest rate								4.00%		5.15%		7.20%		7.20%	7.00%
Principal amount market price percentage							99.594%		99.552%
Debt instrument yield to maturity							4.077%		5.208%
Net proceeds																												543,500,000
Redeemable principal amount percentage																												100.00%
Applicable treasury rate plus basis points	50																											25.00	50
Loss on debt extinguishment			0	(6,600,000)	0	(33,000,000)												25,500,000
Remaining unamortized debt issue costs				900,000		900,000
Interest at the initial term rate per annum																				1.50%			1.50%
Debt tender offer, purchase amount		$ 70,000,000									$ 43,000,000		$ 156,900,000		$ 27,000,000	$ 73,100,000											$ 230,000,000