Subsequent Events	3 Months Ended
Mar. 31, 2015
Subsequent Events [Abstract]
Subsequent Events	16. Subsequent Events Issuance of TECO Finance Floating Rate Notes due 2018 On Apr. 10, 2015, TECO Finance completed an offering of $250 million aggregate principal amount of floating rate notes due 2018 (the 2018 Notes), which are guaranteed by TECO Energy. The 2018 Notes were sold at par and mature on Apr. 10, 2018. The 2018 Notes will bear interest at a floating rate that is reset quarterly based on the three-month LIBOR plus 60 basis points, which is payable quarterly on Jan. 10, Apr. 10, July 10 and Oct. 10 of each year, beginning July 10, 2015. Interest on the 2018 Notes will be computed on the basis of the actual number of days elapsed over a 360-day year. The 2018 Notes will not be subject to redemption prior to maturity. The 2018 Notes are effectively subordinated to existing and future liabilities of TECO Energy’s subsidiaries to their respective creditors, and also are effectively subordinated to any secured debt that TECO Finance and TECO Energy incur to the extent of the value of the assets securing that indebtedness. TECO Finance is a wholly owned subsidiary of TECO Energy whose business activities consist solely of providing funds to TECO Energy. The offering resulted in net proceeds to TECO Finance (after deducting underwriting discounts and commissions and estimated offering expenses) of approximately $248.6 million. TECO Finance will use these net proceeds to repay borrowings under the TECO Finance credit facility and to fund a portion of the redemption of $191 million of TECO Finance notes due in May 2015. Amendment to TECO Coal SPA On Apr. 17, 2015, TECO Diversified entered into an amendment (the Amendment) to the SPA dated as of Oct. 17, 2014, as amended, with Cambrian. As disclosed in Note 15, the SPA related to the sale of all of the ownership interest in TECO Coal to Cambrian, and was subject to termination by either party if specified closing conditions, including the purchaser’s obtaining financing in order to pay a portion of the purchase price, were not met by Apr. 24, 2015. The Amendment extends this date and provides that the SPA, as amended, is subject to termination by either party if the specified closing conditions are not met by June 5, 2015.

16. Subsequent Events

Issuance of TECO Finance Floating Rate Notes due 2018

On Apr. 10, 2015, TECO Finance completed an offering of $250 million aggregate principal amount of floating rate notes due 2018 (the 2018 Notes), which are guaranteed by TECO Energy. The 2018 Notes were sold at par and mature on Apr. 10, 2018. The 2018 Notes will bear interest at a floating rate that is reset quarterly based on the three-month LIBOR plus 60 basis points, which is payable quarterly on Jan. 10, Apr. 10, July 10 and Oct. 10 of each year, beginning July 10, 2015. Interest on the 2018 Notes will be computed on the basis of the actual number of days elapsed over a 360-day year. The 2018 Notes will not be subject to redemption prior to maturity. The 2018 Notes are effectively subordinated to existing and future liabilities of TECO Energy’s subsidiaries to their respective creditors, and also are effectively subordinated to any secured debt that TECO Finance and TECO Energy incur to the extent of the value of the assets securing that indebtedness. TECO Finance is a wholly owned subsidiary of TECO Energy whose business activities consist solely of providing funds to TECO Energy.

The offering resulted in net proceeds to TECO Finance (after deducting underwriting discounts and commissions and estimated offering expenses) of approximately $248.6 million. TECO Finance will use these net proceeds to repay borrowings under the TECO Finance credit facility and to fund a portion of the redemption of $191 million of TECO Finance notes due in May 2015.

Amendment to TECO Coal SPA

On Apr. 17, 2015, TECO Diversified entered into an amendment (the Amendment) to the SPA dated as of Oct. 17, 2014, as amended, with Cambrian. As disclosed in Note 15, the SPA related to the sale of all of the ownership interest in TECO Coal to Cambrian, and was subject to termination by either party if specified closing conditions, including the purchaser’s obtaining financing in order to pay a portion of the purchase price, were not met by Apr. 24, 2015. The Amendment extends this date and provides that the SPA, as amended, is subject to termination by either party if the specified closing conditions are not met by June 5, 2015.