Long Term Debt - Schedule of Maturities of Long-Term Debt (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Schedule Of Maturities Of Long Term Debt [Line Items]
Total Long-Term Debt	$ 2,975.4	$ 3,075.8
Teco Finance [Member]
Schedule Of Maturities Of Long Term Debt [Line Items]
Total Long-Term Debt	1,041.2	1,041.2
Tampa Electric [Member]
Schedule Of Maturities Of Long Term Debt [Line Items]
Total Long-Term Debt	1,702.5	1,768.9
PGS [Member]
Schedule Of Maturities Of Long Term Debt [Line Items]
2013	0
2014	0
2015	0
2016	0
2017	0
Thereafter	231.7
Total Long-Term Debt	231.7	223.4
Debt Maturities [Member] | Teco Finance [Member]
Schedule Of Maturities Of Long Term Debt [Line Items]
2013	0
2014	0
2015	191.2
2016	250.0
2017	300.0
Thereafter	300.0
Total Long-Term Debt	1,041.2
Debt Maturities [Member] | Tampa Electric [Member]
Schedule Of Maturities Of Long Term Debt [Line Items]
2013	0
2014	83.3
2015	83.3
2016	83.4
2017	0
Thereafter	1,452.5
Total Long-Term Debt	1,702.5
Debt Maturities [Member] | PGS [Member]
Schedule Of Maturities Of Long Term Debt [Line Items]
2013	0
2014	0
2015	0
2016	0
2017	0
Thereafter	231.7
Total Long-Term Debt	231.7
Debt Maturities [Member] | Teco Energy [Member]
Schedule Of Maturities Of Long Term Debt [Line Items]
2013	0
2014	83.3
2015	274.5
2016	333.4
2017	300.0
Thereafter	1,984.2
Total Long-Term Debt	$ 2,975.4