Other Comprehensive Income (Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Net unrealized losses from cash flow hedges, tax benefit	$ 6.8	$ 3.2
Tampa Electric Co [Member]
Net unrealized losses from cash flow hedges, tax benefit	$ 5.7	$ 2.9

Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of tax Benefit

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant