Consolidated Condensed Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Allowance for uncollectibles	$ 2.1	$ 2.1
Common equity, shares authorized	400,000,000	400,000,000
Common equity, par value	$ 1	$ 1
Common equity, shares outstanding	235,500,000	235,300,000
Tampa Electric Company [Member]
Allowance for uncollectibles	$ 1.6	$ 1.5