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Other Comprehensive Income - Accumulated Other Comprehensive Loss (Income) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Other Comprehensive Income Loss [Line Items]          
Unrealized gain (loss) on cash flow hedges, Gross $ 0.0 $ (0.3) $ 4.3 $ (0.3)  
Reclassification from AOCI to net income, Gross [1] 0.3 0.4 1.0 0.9  
Gain on cash flow hedges, Gross 0.3 0.1 5.3 0.6  
Amortization of unrecognized benefit costs, Gross [2] 0.4 0.4 2.9 2.4  
Increase in unrecognized postemployment costs, Gross [3]   0.0   (12.9)  
Change in benefit obligation due to valuation, Gross (8.7) [4] (1.1) (8.7) [4] (1.1)  
Recognized cost due to settlement, Gross [5] 12.1   12.1    
Total other comprehensive income (loss), Gross 4.1 (0.6) 11.6 (11.0)  
Unrealized gain (loss) on cash flow hedges, Tax 0.0 0.1 (1.5) 0.1  
Reclassification from AOCI to net income, Tax [1] (0.1) (0.1) (0.5) (0.3)  
Gain on cash flow hedges, Tax (0.1) 0.0 (2.0) (0.2)  
Amortization of unrecognized benefit costs, Tax [2] (0.2) (0.2) (1.1) (0.8)  
Increase in unrecognized postemployment costs, Tax [3]   0.0   4.7  
Change in benefit obligation due to valuation, Tax 3.0 [4] 0.4 3.0 [4] 0.4  
Recognized cost due to settlement, Tax [5] (4.4)   (4.4)    
Total other comprehensive income (loss), Tax (1.7) 0.2 (4.5) 4.1  
Unrealized gain (loss) on cash flow hedges, Net 0.0 (0.2) 2.8 (0.2)  
Reclassification from AOCI to net income, Net [1] 0.2 0.3 0.5 0.6  
Gain on cash flow hedges, Net 0.2 0.1 3.3 0.4  
Amortization of unrecognized benefit costs, Net [2] 0.2 0.2 1.8 1.6  
Increase in unrecognized postemployment costs 0.0 0.0 [3] 0.0 (8.2) [3]  
Change in benefit obligation due to valuation, Net (5.7) [4] (0.7) (5.7) [4] (0.7)  
Recognized cost due to settlement, Net 7.7 [5] 0.0 7.7 [5] 0.0  
Other comprehensive income (loss), net of tax 2.4 (0.4) 7.1 (6.9)  
Unamortized pension loss and prior service credit [6] (25.8)   (25.8)   $ (22.5)
Unamortized other benefit gains, prior service costs and transition obligations [7] 21.0   21.0   13.9
Net unrealized gains (losses) from cash flow hedges [8] (3.8)   (3.8)   (7.1)
Total accumulated other comprehensive loss (8.6)   (8.6)   (15.7)
Tampa Electric Company [Member]          
Other Comprehensive Income Loss [Line Items]          
Unrealized gain (loss) on cash flow hedges, Gross 0.0 0.0 4.3 0.0  
Reclassification from AOCI to net income, Gross 0.3 0.4 1.0 0.8  
Gain on cash flow hedges, Gross 0.3 0.4 5.3 0.8  
Total other comprehensive income (loss), Gross 0.3 0.4 5.3 0.8  
Unrealized gain (loss) on cash flow hedges, Tax 0.0 0.0 (1.5) 0.0  
Reclassification from AOCI to net income, Tax (0.1) (0.1) (0.5) (0.3)  
Gain on cash flow hedges, Tax (0.1) (0.1) (2.0) (0.3)  
Total other comprehensive income (loss), Tax (0.1) (0.1) (2.0) (0.3)  
Unrealized gain (loss) on cash flow hedges, Net 0.0 0.0 2.8 0.0  
Reclassification from AOCI to net income, Net 0.2 0.3 0.5 0.5  
Gain on cash flow hedges, Net 0.2 0.3 3.3 0.5  
Other comprehensive income (loss), net of tax 0.2 $ 0.3 3.3 $ 0.5  
Net unrealized gains (losses) from cash flow hedges [8] (3.8)   (3.8)   (7.1)
Total accumulated other comprehensive loss $ (3.8)   $ (3.8)   $ (7.1)
[1] Related to interest rate contracts recognized in Interest expense and commodity contracts recognized in Income (loss) from discontinued operations.
[2] Related to postretirement and postemployment benefits. See Note 5 for additional information.
[3] Amounts reflect an out-of-period adjustment related to TECO Coal's unfunded black lung liability.
[4] Related to the transfer of employees and their associated postretirement benefits from TEC to the TECO Energy shared services company. TEC recognized these deferred costs as regulatory assets, whereas the shared services company recognized them in AOCI.
[5] Related to the settlement of the TECO Coal black lung obligation at the closing of the sale. See Notes 5 and 15 for additional information.
[6] Net of tax benefit of $16.2 million and $13.8 million as of Sept. 30, 2015 and Dec. 31, 2014, respectively.
[7] Net of tax expense of $13.2 million and $8.3 million as of Sept. 30, 2015 and Dec. 31, 2014, respectively.
[8] Net of tax benefit of $2.4 million and $4.5 million as of Sept. 30, 2015 and Dec. 31, 2014, respectively.