Long Term Debt - Schedule of Maturities of Long-Term Debt (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Schedule Of Maturities Of Long Term Debt [Line Items]
Total Long-Term Debt	$ 2,923.8	$ 2,975.4
TECO Finance [Member]
Schedule Of Maturities Of Long Term Debt [Line Items]
Total Long-Term Debt	1,041.2	1,041.2
Tampa Electric Company [Member]
Schedule Of Maturities Of Long Term Debt [Line Items]
2014	83.3
2015	83.3
2016	83.4
2017	0
2018	254.2
Thereafter	1,146.7
Total Long-Term Debt	1,650.9	1,702.5
PGS [Member]
Schedule Of Maturities Of Long Term Debt [Line Items]
Total Long-Term Debt	231.7	231.7
Debt Maturities [Member] | TECO Finance [Member]
Schedule Of Maturities Of Long Term Debt [Line Items]
2014	0
2015	191.2
2016	250.0
2017	300.0
2018	0
Thereafter	300.0
Total Long-Term Debt	1,041.2
Debt Maturities [Member] | Tampa Electric Company [Member]
Schedule Of Maturities Of Long Term Debt [Line Items]
2014	83.3
2015	83.3
2016	83.4
2017	0
2018	254.2
Thereafter	1,146.7
Total Long-Term Debt	1,650.9
Debt Maturities [Member] | PGS [Member]
Schedule Of Maturities Of Long Term Debt [Line Items]
2014	0
2015	0
2016	0
2017	0
2018	50.0
Thereafter	181.7
Total Long-Term Debt	231.7
Debt Maturities [Member] | TECO Energy [Member]
Schedule Of Maturities Of Long Term Debt [Line Items]
2014	83.3
2015	274.5
2016	333.4
2017	300.0
2018	304.2
Thereafter	1,628.4
Total Long-Term Debt	$ 2,923.8