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Supplemental Financial Information (Tables)
 6 Months Ended
Jun. 30, 2016
Supplemental Financial Information [Line Items]  
Schedule of Supplemental Financial Information
Accounts receivable and Inventories are as follows at June 30, 2016 and December 31, 2015:
 
 
June 30,
 
December 31,
$ in millions
 
2016
 
2015
Accounts receivable, net:
 
 
 
 
Unbilled revenue

$
38.9

 
$
43.3

Customer receivables
 
54.1

 
56.4

Amounts due from partners in jointly owned plants
 
10.9

 
16.0

Other
 
4.9

 
6.0

Provision for uncollectible accounts
 
(1.0
)
 
(0.8
)
Total accounts receivable, net
 
$
107.8

 
$
120.9

Inventories, at average cost:
 
 
 
 
Fuel and limestone
 
$
49.9

 
$
72.2

Plant materials and supplies
 
35.7

 
34.9

Other
 
1.9

 
2.0

Total inventories, at average cost
 
$
87.5

 
$
109.1
Reclassification out of Accumulated Other Comprehensive Income
The amounts reclassified out of Accumulated Other Comprehensive Income / (Loss) by component during the three and six months ended June 30, 2016 and 2015 are as follows:
Details about Accumulated Other Comprehensive Income / (Loss) components
 
Affected line item in the Condensed Consolidated Statements of Operations
 
Three months ended
 
Six months ended
 
 
 
 
June 30,
 
June 30,
$ in millions
 
 
 
2016
 
2015
 
2016
 
2015
Gains and losses on Available-for-sale securities activity (Note 3):
 
 
 
 
 
 
 
 
Other income
 
$
0.1

 
$
0.6

 
$
—

 
$
—

 
 
Tax benefit
 
—

 
(0.2
)
 
—

 
—

 
 
Net of income taxes
 
0.1

 
0.4

 
—

 
—

Gains and losses on cash flow hedges (Note 4):
 
 
 
 
 
 
 
 
 
 
Interest expense
 
(0.3
)
 
(0.3
)
 
(0.5
)
 
(0.5
)
 
 
Revenue
 
(20.1
)
 
(2.9
)
 
(37.3
)
 
(3.2
)
 
 
Purchased power
 
3.7

 
0.4

 
8.1

 
1.8

 
 
Total before income taxes
 
(16.7
)
 
(2.8
)
 
(29.7
)
 
(1.9
)
 
 
Tax expense
 
5.9

 
0.9

 
10.7

 
0.5

 
 
Net of income taxes
 
(10.8
)
 
(1.9
)
 
(19.0
)
 
(1.4
)
Amortization of defined benefit pension items (Note 7):
 
 
 
 
 
 
 
 
 
 
Operation and maintenance
 
0.1

 
0.1

 
0.2

 
0.2

 
 
Tax benefit
 
—

 
(0.5
)
 
(0.2
)
 
(0.4
)
 
 
Net of income taxes
 
0.1

 
(0.4
)
 
—

 
(0.2
)
 
 
 
 
 
 
 
 
 
 
 
Total reclassifications for the period, net of income taxes
 
$
(10.6
)
 
$
(1.9
)
 
$
(19.0
)
 
$
(1.6
)
Schedule of Accumulated Other Comprehensive Income (Loss)
The changes in the components of Accumulated Other Comprehensive Income / (Loss) during the six months ended June 30, 2016 are as follows:
$ in millions
 
Gains / (losses) on available-for-sale securities
 
Gains / (losses) on cash flow hedges
 
Change in unfunded pension obligation
 
Total
Balance January 1, 2016
 
$
0.4

 
$
26.7

 
$
(9.7
)
 
$
17.4

 
 
 
 
 
 
 
 
 
Other comprehensive income before reclassifications
 
0.1

 
13.0

 
—

 
13.1

Amounts reclassified from accumulated other comprehensive income / (loss)
 
—

 
(19.0
)
 
—

 
(19.0
)
Net current period other comprehensive income / (loss)
 
0.1

 
(6.0
)
 
—

 
(5.9
)
 
 
 
 
 
 
 
 
 
Balance June 30, 2016
 
$
0.5

 
$
20.7

 
$
(9.7
)
 
$
11.5
THE DAYTON POWER AND LIGHT COMPANY [Member]  
Supplemental Financial Information [Line Items]  
Schedule of Supplemental Financial Information
Accounts receivable and Inventories are as follows at June 30, 2016 and December 31, 2015:
 
 
June 30,
 
December 31,
$ in millions
 
2016
 
2015
Accounts receivable, net:
 
 
 
 
Unbilled revenue
 
$
38.9

 
$
43.3

Customer receivables
 
50.8

 
54.1

Amounts due from partners in jointly owned plants
 
10.9

 
16.0

Other
 
6.0

 
6.9

Provision for uncollectible accounts
 
(1.0
)
 
(0.8
)
Total accounts receivable, net
 
$
105.6

 
$
119.5

 
 
 
 
 
Inventories, at average cost:
 
 
 
 
Fuel and limestone
 
$
50.0

 
$
72.2

Plant materials and supplies
 
34.4

 
33.7

Other
 
2.0

 
2.1

Total inventories, at average cost
 
$
86.4

 
$
108.0
Reclassification out of Accumulated Other Comprehensive Income
The amounts reclassified out of Accumulated Other Comprehensive Income / (Loss) by component during the three and six months ended June 30, 2016 and 2015 are as follows:

Details about Accumulated Other Comprehensive Income / (Loss) components
 
Affected line item in the Condensed Statements of Operations
 
Three months ended
 
Six months ended
 
 
 
 
June 30,
 
June 30,
$ in millions
 
 
 
2016
 
2015
 
2016
 
2015
Gains and losses on Available-for-sale securities activity (Note 3):
 
 
 
 
 
 
 
 
Other income
 
$
0.1

 
$
0.6

 
$
—

 
$
—

 
 
Tax benefit
 
—

 
(0.2
)
 
—

 
—

 
 
Net of income taxes
 
0.1

 
0.4

 
—

 
—

Gains and losses on cash flow hedges (Note 4):
 
 
 
 
 
 
 
 
 
 
Interest expense
 
(0.3
)
 
(0.3
)
 
(0.6
)
 
(0.6
)
 
 
Revenue
 
(20.1
)
 
(2.9
)
 
(37.2
)
 
(3.2
)
 
 
Purchased power
 
3.7

 
0.4

 
8.1

 
1.8

 
 
Total before income taxes
 
(16.7
)
 
(2.8
)
 
(29.7
)
 
(2.0
)
 
 
Tax expense
 
5.9

 
1.0

 
10.5

 
0.7

 
 
Net of income taxes
 
(10.8
)
 
(1.8
)
 
(19.2
)
 
(1.3
)
Amortization of defined benefit pension items (Note 7):
 
 
 
 
 
 
 
 
 
 
Operation and maintenance
 
1.1

 
1.4

 
2.2

 
2.8

 
 
Tax benefit
 
(0.4
)
 
(0.5
)
 
(1.2
)
 
(1.0
)
 
 
Net of income taxes
 
0.7

 
0.9

 
1.0

 
1.8

 
 
 
 
 
 
 
 
 
 
 
Total reclassifications for the period, net of income taxes
 
$
(10.0
)
 
$
(0.5
)
 
$
(18.2
)
 
$
0.5
Schedule of Accumulated Other Comprehensive Income (Loss)
The changes in the components of Accumulated Other Comprehensive Income / (Loss) during the six months ended June 30, 2016 are as follows:

$ in millions
 
Gains / (losses) on available-for-sale securities
 
Gains / (losses) on cash flow hedges
 
Change in unfunded pension obligation
 
Total
Balance January 1, 2016
 
$
0.5

 
$
11.2

 
$
(40.4
)
 
$
(28.7
)
 
 
 
 
 
 
 
 
 
Other comprehensive income before reclassifications
 
0.1

 
13.0

 
—

 
13.1

Amounts reclassified from accumulated other comprehensive income / (loss)
 
—

 
(19.2
)
 
1.0

 
(18.2
)
Net current period other comprehensive income / (loss)
 
0.1

 
(6.2
)
 
1.0

 
(5.1
)
 
 
 
 
 
 
 
 
 
Balance June 30, 2016
 
$
0.6

 
$
5.0

 
$
(39.4
)
 
$
(33.8
)