Consolidated Condensed Statements of Income and Comprehensive Income (Unaudited) (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Franchise fees and gross receipts taxes	$ 31.7	$ 29.7	$ 86.7	$ 81.8
Tampa Electric Company [Member]
Franchise fees and gross receipts taxes	31.7	29.7	86.7	81.8
Tampa Electric Company [Member] | Electric [Member]
Franchise fees and gross receipts taxes	27.4	25.6	70.4	66.1
Tampa Electric Company [Member] | Gas [Member]
Franchise fees and gross receipts taxes	$ 4.3	$ 4.1	$ 16.3	$ 15.7