Consolidated Condensed Statements of Income and Comprehensive Income (Unaudited) (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Franchise fees and gross receipts taxes	$ 27.8	$ 26.7	$ 55.0	$ 52.1
Tampa Electric Company [Member]
Franchise fees and gross receipts taxes	27.8	26.7	55.0	52.1
Tampa Electric Company [Member] | Electric [Member]
Franchise fees and gross receipts taxes	22.7	21.5	43.0	40.5
Tampa Electric Company [Member] | Gas [Member]
Franchise fees and gross receipts taxes	$ 5.1	$ 5.2	$ 12.0	$ 11.6