Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2013

Schedule of Recurring Fair Value Measurements

For natural gas and diesel fuel swaps, the market approach was used in determining fair value.

Recurring Fair Value Measures
	At fair value as of Dec. 31, 2013
(millions)	Level 1		Level 2		Level 3		Total
Assets
Natural gas swaps	$	0.0	$	9.8	$	0.0	$	9.8
Diesel fuel swaps		0.0		0.2		0.0		0.2
Total	$	0.0	$	10.0	$	0.0	$	10.0
Liabilities
Natural gas swaps	$	0.0	$	0.2	$	0.0	$	0.2
Diesel fuel swaps		0.0		0.1		0.0		0.1
Total	$	0.0	$	0.3	$	0.0	$	0.3
	At fair value as of Dec. 31, 2012
(millions)	Level 1		Level 2		Level 3		Total
Assets
Natural gas swaps	$	0.0	$	0.2	$	0.0	$	0.2
Diesel fuel swaps		0.0		0.0		0.0		0.0
Total	$	0.0	$	0.2	$	0.0	$	0.2
Liabilities
Natural gas swaps	$	0.0	$	14.3	$	0.0	$	14.3
Diesel fuel swaps		0.0		0.9		0.0		0.9
Total	$	0.0	$	15.2	$	0.0	$	15.2

Tampa Electric Company [Member]

Schedule of Recurring Fair Value Measurements

For all assets and liabilities presented below, the market approach was used in determining fair value.

Recurring Derivative Fair Value Measures
	At fair value as of Dec. 31, 2013
(millions)	Level 1		Level 2		Level 3		Total
Assets
Natural gas swaps	$	0.0	$	9.8	$	0.0	$	9.8
Total	$	0.0	$	9.8	$	0.0	$	9.8
Liabilities
Natural gas swaps	$	0.0	$	0.2	$	0.0	$	0.2
Total	$	0.0	$	0.2	$	0.0	$	0.2
	At fair value as of Dec. 31, 2012
(millions)	Level 1		Level 2		Level 3		Total
Assets
Natural gas swaps	$	0.0	$	0.2	$	0.0	$	0.2
Total	$	0.0	$	0.2	$	0.0	$	0.2
Liabilities
Natural gas swaps	$	0.0	$	14.3	$	0.0	$	14.3
Total	$	0.0	$	14.3	$	0.0	$	14.3