Other Comprehensive Income - Accumulated Other Comprehensive Loss (Income) (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Other Comprehensive Income Loss [Line Items]
Net unrealized losses from cash flow hedges, tax benefit	$ 4.7	$ 4.9
Tampa Electric Company [Member]
Other Comprehensive Income Loss [Line Items]
Net unrealized losses from cash flow hedges, tax benefit	$ 4.6	$ 4.9

Accumulated other comprehensive income loss cumulative changes in net gain loss from cash flow hedges effect tax.

No definition available.

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant