Consolidated Condensed Statements Of Income (Parenthetical) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Franchise fees and gross receipts taxes	$ 28.8	$ 31.0	$ 84.3	$ 90.0
Tampa Electric Co [Member] | Electric [Member]
Franchise fees and gross receipts taxes	24.7	26.4	65.3	69.6
Tampa Electric Co [Member] | Gas [Member]
Franchise fees and gross receipts taxes	4.1	4.6	19.0	20.4
Electric And Gas [Member]
Franchise fees and gross receipts taxes	28.8	31.0	84.3	90.0
Tampa Electric Co [Member]
Franchise fees and gross receipts taxes	$ 28.8	$ 31.0	$ 84.3	$ 90.0