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Supplemental Financial Information (Tables)
 3 Months Ended
Mar. 31, 2016
Supplemental Financial Information [Line Items]  
Schedule of Supplemental Financial Information
Accounts receivable and Inventories are as follows at March 31, 2016 and December 31, 2015:
 
 
March 31,
 
December 31,
$ in millions
 
2016
 
2015
Accounts receivable, net:
 
 
 
 
Unbilled revenue
 
$
33.0

 
$
43.3

Customer receivables
 
69.6

 
56.4

Amounts due from partners in jointly owned plants
 
11.4

 
16.0

Other
 
7.8

 
6.0

Provision for uncollectible accounts
 
(0.9
)
 
(0.8
)
Total accounts receivable, net
 
$
120.9

 
$
120.9

Inventories, at average cost:
 
 
 
 
Fuel and limestone
 
$
52.7

 
$
72.2

Plant materials and supplies
 
35.0

 
34.9

Other
 
2.4

 
2.0

Total inventories, at average cost
 
$
90.1

 
$
109.1
Reclassification out of Accumulated Other Comprehensive Income
The amounts reclassified out of Accumulated Other Comprehensive Income / (Loss) by component during the three months ended March 31, 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
 
 
 
 
March 31,
$ in millions
 
 
 
2016
 
2015
Gains and losses on Available-for-sale securities activity (Note 3):
 
 
 
 
 
Other income
 
$
(0.1
)
 
$
(0.6
)
 
 
Tax expense
 
—

 
0.2

 
 
Net of income taxes
 
(0.1
)
 
(0.4
)
Gains and losses on cash flow hedges (Note 4):
 
 
 
 
 
 
Interest expense
 
(0.2
)
 
(0.2
)
 
 
Revenue
 
(17.2
)
 
(0.3
)
 
 
Purchased power
 
4.4

 
1.4

 
 
Total before income taxes
 
(13.0
)
 
0.9

 
 
Tax expense
 
4.8

 
(0.3
)
 
 
Net of income taxes
 
(8.2
)
 
0.6

Amortization of defined benefit pension items (Note 7):
 
 
 
 
 
 
Operation and maintenance
 
0.1

 
0.1

 
 
Tax expense
 
(0.1
)
 
—

 
 
Net of income taxes
 
—

 
0.1

 
 
 
 
 
 
 
Total reclassifications for the period, net of income taxes
 
$
(8.3
)
 
$
0.3
Schedule of Accumulated Other Comprehensive Income (Loss)
The changes in the components of Accumulated Other Comprehensive Income / (Loss) during the three months ended March 31, 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
 
0.2

 
21.5

 
—

 
21.7

Amounts reclassified from accumulated other comprehensive income / (loss)
 
(0.1
)
 
(8.2
)
 
—

 
(8.3
)
Net current period other comprehensive income
 
0.1

 
13.3

 
—

 
13.4

 
 
 
 
 
 
 
 
 
Balance March 31, 2016
 
$
0.5

 
$
40.0

 
$
(9.7
)
 
$
30.8
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 March 31, 2016 and December 31, 2015:
 
 
March 31,
 
December 31,
$ in millions
 
2016
 
2015
Accounts receivable, net:
 
 
 
 
Unbilled revenue
 
$
33.0

 
$
43.3

Customer receivables
 
67.7

 
54.1

Amounts due from partners in jointly owned plants
 
11.4

 
16.0

Other
 
9.0

 
6.9

Provision for uncollectible accounts
 
(0.9
)
 
(0.8
)
Total accounts receivable, net
 
$
120.2

 
$
119.5

 
 
 
 
 
Inventories, at average cost:
 
 
 
 
Fuel and limestone
 
$
52.7

 
$
72.2

Plant materials and supplies
 
33.8

 
33.7

Other
 
2.3

 
2.1

Total inventories, at average cost
 
$
88.8

 
$
108.0
Reclassification out of Accumulated Other Comprehensive Income
The amounts reclassified out of Accumulated Other Comprehensive Income / (Loss) by component during the three months ended March 31, 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
 
 
 
 
March 31,
$ in millions
 
 
 
2016
 
2015
Gains and losses on Available-for-sale securities activity (Note 3):
 
 
 
 
 
Other income
 
$
(0.1
)
 
$
(0.6
)
 
 
Tax expense
 
—

 
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
)
 
 
Revenue
 
(17.1
)
 
(0.3
)
 
 
Purchased power
 
4.4

 
1.4

 
 
Total before income taxes
 
(13.0
)
 
0.8

 
 
Tax expense
 
4.6

 
(0.3
)
 
 
Net of income taxes
 
(8.4
)
 
0.5

Amortization of defined benefit pension items (Note 7):
 
 
 
 
 
 
Operation and maintenance
 
1.1

 
1.4

 
 
Tax benefit
 
(0.8
)
 
(0.5
)
 
 
Net of income taxes
 
0.3

 
0.9

 
 
 
 
 
 
 
Total reclassifications for the period, net of income taxes
 
$
(8.2
)
 
$
1.0
Schedule of Accumulated Other Comprehensive Income (Loss)
The changes in the components of Accumulated Other Comprehensive Income / (Loss) during the three months ended March 31, 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
 
0.2

 
21.5

 
—

 
21.7

Amounts reclassified from accumulated other comprehensive income / (loss)
 
(0.1
)
 
(8.4
)
 
0.3

 
(8.2
)
Net current period other comprehensive income
 
0.1

 
13.1

 
0.3

 
13.5

 
 
 
 
 
 
 
 
 
Balance March 31, 2016
 
$
0.6

 
$
24.3

 
$
(40.1
)
 
$
(15.2
)