Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2016

Schedule of Recurring Fair Value Measurements

Recurring Fair Value Measures
	As of Sept. 30, 2016
(millions)	Level 1		Level 2		Level 3		Total
Assets
Natural gas derivatives	$	0.0	$	2.2	$	0.0	$	2.2
Liabilities
Natural gas derivatives	$	0.0	$	1.7	$	0.0	$	1.7
	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 Sept. 30, 2016
(millions)	Level 1		Level 2		Level 3		Total
Assets
Natural gas swaps	$	0.0	$	1.5	$	0.0	$	1.5
Liabilities
Natural gas swaps	$	0.0	$	1.5	$	0.0	$	1.5
	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