Consolidated Condensed Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Allowance for uncollectibles	$ 2.9	$ 2.1
Common equity, shares authorized	10,000,000	400,000,000
Common equity, par value	$ 0.01	$ 1
Common equity, shares outstanding	1,000	235,300,000
Tampa Electric Company [Member]
Allowance for uncollectibles	$ 2.5	$ 1.5