Consolidated Statements of Capital (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Balance	$ 2,267.2		$ 2,170.6		$ 2,085.4
Net income	213.0		272.9		239.6
Other comprehensive income, after tax	(9.0)		(4.8)		7.8
Common stock issued	(2.9)		1.0		3.6
Cash dividends declared	(190.4)		(183.2)		(174.7)
Stock compensation expense	12.0		9.1		7.4
Noncontrolling - dividends	(0.3)		(0.6)		(0.7)
Noncontrolling - effect of TCAE consolidation					1.0
Tax benefits - stock options	2.8		2.2		1.2
Balance	2,291.8		2,267.2		2,170.6
Noncontrolling - sale of business	(0.6)
Common Stock [Member]
Balance	215.8		214.9		213.9
Balance, shares	215.8	[1]	214.9	[1]	213.9	[1]
Common stock issued	0.8		0.9		1.0
Common stock issued, shares	0.8	[1]	0.9	[1]	1.0	[1]
Balance	216.6		215.8		214.9
Balance, shares	216.6	[1]	215.8	[1]	214.9	[1]
Additional Paid in Capital [Member]
Balance	1,553.4		1,542.0		1,530.8
Common stock issued	(3.7)		0.1		2.6
Stock compensation expense	12.0		9.1		7.4
Tax benefits - stock options	2.8		2.2		1.2
Balance	1,564.5		1,553.4		1,542.0
Retained Earnings [Member]
Balance	519.4		430.0		365.7
Net income	212.7		272.6		239.0
Cash dividends declared	(190.4)		(183.2)		(174.7)
Balance	541.7		519.4		430.0
Accumulated Other Comprehensive Income (Loss) [Member]
Balance	(22.0)		(17.2)		(25.0)
Other comprehensive income, after tax	(9.0)		(4.8)		7.8
Balance	(31.0)		(22.0)		(17.2)
Noncontrolling Interest [Member]
Balance	0.6		0.9		0
Net income	0.3		0.3		0.6
Noncontrolling - dividends	(0.3)		(0.6)		(0.7)
Noncontrolling - effect of TCAE consolidation					1.0
Balance	0		0.6		0.9
Noncontrolling - sale of business	$ (0.6)

[1] TECO Energy had a maximum of 400.0 million shares of $1 par value common stock authorized as of Dec. 31, 2012, 2011, 2010 and 2009.