Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2016

Schedule of Recurring Fair Value Measurements

Recurring Fair Value Measures
	As of June 30, 2016
(millions)	Level 1		Level 2		Level 3		Total
Assets
Natural gas derivatives	$	0.0	$	5.5	$	0.0	$	5.5
Liabilities
Natural gas derivatives	$	0.0	$	1.1	$	0.0	$	1.1
	As of Dec. 31, 2015
(millions)	Level 1		Level 2		Level 3		Total
Assets
Natural gas derivatives	$	0.0	$	0.2	$	0.0	$	0.2
Liabilities
Natural gas derivatives	$	0.0	$	26.2	$	0.0	$	26.2

Tampa Electric Company [Member]

Schedule of Recurring Fair Value Measurements

Recurring Derivative Fair Value Measures
	As of June 30, 2016
(millions)	Level 1		Level 2		Level 3		Total
Assets
Natural gas swaps	$	0.0	$	4.9	$	0.0	$	4.9
Liabilities
Natural gas swaps	$	0.0	$	0.7	$	0.0	$	0.7
	As of Dec. 31, 2015
(millions)	Level 1		Level 2		Level 3		Total
Liabilities
Natural gas swaps	$	0.0	$	26.2	$	0.0	$	26.2