Debt instrument maturity date year.

No definition available.

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Balance Type:	na
Period Type:	duration

- Definition

Debt instrument principal amount market price percentage.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

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

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets.

+ References

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the debt instrument was offered for sale, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Start date of debt instrument redemption period, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

+ Details

Name:	us-gaap_DebtInstrumentRedemptionPricePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of principal amount of debt redeemed.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the debt instrument was repurchased, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 20, 22
-Article 5

+ Details

Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

Name:	us-gaap_LongTermDebtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_ProceedsFromDebtNetOfIssuanceCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585

Reference 2: 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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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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Long-Term Debt - Additional Information (Detail) - USD ($) $ in Millions									12 Months Ended
	May. 20, 2015	Apr. 10, 2015	Sep. 02, 2014	Jul. 16, 2014	May. 15, 2014	Sep. 03, 2013	Mar. 15, 2012	Feb. 08, 2011	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Sep. 01, 2013
Debt Instrument [Line Items]
Long-term debt, carrying amount									$ 3,850.2	$ 3,628.5
Estimated fair value									4,061.6	3,987.8
Purchase in lieu of redemption									274.5	83.3	$ 51.6
Held Bonds [Member]
Debt Instrument [Line Items]
Purchase in lieu of redemption									232.6
HCIDA Pollution Control Revenue Refunding Bonds [Member] \| Held Bonds [Member]
Debt Instrument [Line Items]
Purchase in lieu of redemption									$ 232.6
TECO Finance [Member]
Debt Instrument [Line Items]
Debt instrument maturity date		May 31, 2015
TECO Finance [Member] \| Floating Rate Notes Due 2018 [Member]
Debt Instrument [Line Items]
Aggregate principal amount issued		$ 250.0
Debt instrument, offering date		Apr. 10, 2015
Debt instrument maturity date		Apr. 10, 2018
Basis spread on federal funds rate		0.60%
Interest rate, description									The 2018 Notes bear interest at a floating rate that is reset quarterly based on the three-month LIBOR plus 60 basis points.
Net proceeds from offering		$ 248.6
TECO Finance [Member] \| Notes Matured in May 2015 [Member] \| The TEC 2015 Notes
Debt Instrument [Line Items]
Payment of notes		$ 191.0
Tampa Electric Company [Member]
Debt Instrument [Line Items]
Long-term debt, carrying amount									$ 2,263.1	2,097.1
Purchase in lieu of redemption									$ 83.3	$ 83.3	$ 51.6
Tampa Electric Company [Member] \| 4.35% Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount issued					$ 300.0
Debt instrument, offering date					May 15, 2014
Debt instrument maturity date					Jan. 01, 2044
Basis spread on federal funds rate					0.15%
Net proceeds from offering					$ 296.6
Stated interest rate					4.35%				4.35%
Debt instrument principal amount market price percentage					99.933%
Redeemable principal amount percentage					100.00%
Redeemable principal amount percentage					100.00%
Debt instrument, start date of redemption					Nov. 15, 2043
Debt instrument, maturity year					2044
Tampa Electric Company [Member] \| 4.20% Notes [Member] \| The TEC 2015 Notes
Debt Instrument [Line Items]
Aggregate principal amount issued	$ 250.0
Debt instrument, offering date	May 20, 2015
Debt instrument maturity date	May 15, 2045
Basis spread on federal funds rate	0.20%
Net proceeds from offering	$ 246.8
Stated interest rate	4.20%
Debt instrument principal amount market price percentage	99.814%
Redeemable principal amount percentage	100.00%
Redeemable principal amount percentage	100.00%
Debt instrument, start date of redemption	Nov. 15, 2044
Tampa Electric Company [Member] \| HCIDA Pollution Control Revenue Refunding Bonds [Member]
Debt Instrument [Line Items]
Stated interest rate							5.00%					5.15%
Purchase in lieu of redemption						$ 51.6	$ 86.0
Debt instrument, repurchase date						Sep. 03, 2013	Mar. 15, 2012
NMGI [Member] \| Series A Senior Unsecured Notes 2.71% Notes due 2019 [Member]
Debt Instrument [Line Items]
Aggregate principal amount issued			$ 50.0
Debt instrument, offering date			Sep. 02, 2014
Basis spread on federal funds rate			0.50%
Net proceeds from offering			$ 198.4
Stated interest rate			2.71%
Debt instrument principal amount market price percentage			100.00%
Redeemable principal amount percentage			100.00%
Debt instrument, start date of redemption			Jul. 30, 2019
NMGI [Member] \| Series B Senior Unsecured 3.64 % Notes due 2024 [Member]
Debt Instrument [Line Items]
Aggregate principal amount issued			$ 150.0
Debt instrument, offering date			Sep. 02, 2014
Basis spread on federal funds rate			0.50%
Net proceeds from offering			$ 198.4
Stated interest rate			3.64%
Debt instrument principal amount market price percentage			100.00%
Redeemable principal amount percentage			100.00%
Debt instrument, start date of redemption			Jul. 30, 2024
NMGC [Member] \| Senior Unsecured 3.54 % Notes due 2026 [Member]
Debt Instrument [Line Items]
Aggregate principal amount issued			$ 70.0
Debt instrument, offering date			Sep. 02, 2014
Basis spread on federal funds rate			0.50%
Net proceeds from offering			$ 69.3
Stated interest rate			3.54%
Debt instrument principal amount market price percentage			100.00%
Redeemable principal amount percentage			100.00%
Debt instrument, start date of redemption			Jul. 30, 2026
NMGC [Member] \| New Mexico Gas Company 4.87 % Notes due 2021 [Member]
Debt Instrument [Line Items]
Aggregate principal amount issued								$ 200.0
Debt instrument, offering date				Jul. 16, 2014				Feb. 08, 2011
Debt instrument maturity date								Feb. 08, 2021
Stated interest rate								4.87%