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Supplemental Financial Information (Tables)
 9 Months Ended
Sep. 30, 2015
Supplemental Financial Information [Line Items]  
Schedule of Supplemental Financial Information
Accounts receivable and Inventories are as follows at September 30, 2015 and December 31, 2014:
 
 
September 30,
 
December 31,
$ in millions
 
2015
 
2014
Accounts receivable, net:
 
 
 
 
Unbilled revenue
 
$
49.3

 
$
79.2

Customer receivables
 
86.8

 
104.8

Amounts due from partners in jointly owned plants
 
12.0

 
14.2

Other
 
5.6

 
4.0

Provision for uncollectible accounts
 
(1.0
)
 
(1.3
)
Total accounts receivable, net
 
$
152.7

 
$
200.9

Inventories, at average cost:
 
 
 
 
Fuel and limestone
 
$
60.3

 
$
65.3

Plant materials and supplies
 
34.7

 
33.5

Other
 
2.0

 
1.4

Total inventories, at average cost
 
$
97.0

 
$
100.2
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
The amounts reclassified out of Accumulated Other Comprehensive Income / (Loss) by component during the three and nine months ended September 30, 2015 and 2014 are as follows:
Details about Accumulated Other Comprehensive Income / (Loss) components
 
Affected line item in the Condensed Consolidated Statements of Operations
 
Three months ended
 
Nine months ended
 
 
 
 
September 30,
 
September 30,
$ in millions
 
 
 
2015
 
2014
 
2015
 
2014
Gains and losses on Available-for-sale securities activity (Note 8):
 
 
 
 
 
 
 
 
Other income
 
$
—

 
$
0.3

 
$
—

 
$
0.6

 
 
Tax expense
 
—

 
(0.1
)
 
—

 
(0.2
)
 
 
Net of income taxes
 
—

 
0.2

 
—

 
0.4

Gains and losses on cash flow hedges (Note 9):
 
 
 
 
 
 
 
 
 
 
Interest expense
 
(0.2
)
 
(0.3
)
 
(0.7
)
 
(1.0
)
 
 
Revenue
 
(3.8
)
 
4.9

 
(7.0
)
 
23.4

 
 
Purchased power
 
0.9

 
0.3

 
2.7

 
(0.8
)
 
 
Total before income taxes
 
(3.1
)
 
4.9

 
(5.0
)
 
21.6

 
 
Tax expense
 
1.1

 
(1.5
)
 
1.6

 
(7.4
)
 
 
Net of income taxes
 
(2.0
)
 
3.4

 
(3.4
)
 
14.2

Amortization of defined benefit pension items (Note 7):
 
 
 
 
 
 
 
 
 
 
Other income
 
0.1

 
—

 
0.3

 
—

 
 
Tax expense
 
—

 
—

 
(0.4
)
 
—

 
 
Net of income taxes
 
0.1

 
—

 
(0.1
)
 
—

 
 
 
 
 
 
 
 
 
 
 
Total reclassifications for the period, net of income taxes
 
$
(1.9
)
 
$
3.6

 
$
(3.5
)
 
$
14.6
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The changes in the components of Accumulated Other Comprehensive Income / (Loss) during the nine months ended September 30, 2015 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, 2015
 
$
0.5

 
$
18.5

 
$
(11.5
)
 
$
7.5

 
 
 
 
 
 
 
 
 
Other comprehensive income before reclassifications
 
(0.2
)
 
9.6

 
—

 
9.4

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

 
(3.4
)
 
(0.1
)
 
(3.5
)
Net current period other comprehensive income / (loss)
 
(0.2
)
 
6.2

 
(0.1
)
 
5.9

 
 
 
 
 
 
 
 
 
Balance September 30, 2015
 
$
0.3

 
$
24.7

 
$
(11.6
)
 
$
13.4
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 September 30, 2015 and December 31, 2014:
 
 
September 30,
 
December 31,
$ in millions
 
2015
 
2014
Accounts receivable, net:
 
 
 
 
Unbilled revenue
 
$
34.8

 
$
49.0

Customer receivables
 
63.6

 
68.7

Amounts due from partners in jointly owned plants
 
12.0

 
14.2

Other
 
7.6

 
21.7

Provision for uncollectible accounts
 
(0.9
)
 
(0.9
)
Total accounts receivable, net
 
$
117.1

 
$
152.7

 
 
 
 
 
Inventories, at average cost:
 
 
 
 
Fuel and limestone
 
$
60.4

 
$
65.3

Plant materials and supplies
 
33.6

 
32.3

Other
 
1.9

 
1.4

Total inventories, at average cost
 
$
95.9

 
$
99.0
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
The amounts reclassified out of Accumulated Other Comprehensive Income / (Loss) by component during the three and nine months ended September 30, 2015 and 2014 are as follows:

Details about Accumulated Other Comprehensive Income / (Loss) components
 
Affected line item in the Condensed Statements of Operations
 
Three months ended
 
Nine months ended
 
 
 
 
September 30,
 
September 30,
$ in millions
 
 
 
2015
 
2014
 
2015
 
2014
Gains and losses on Available-for-sale securities activity (Note 8):
 
 
 
 
 
 
 
 
Other income
 
$
—

 
$
0.3

 
$
—

 
$
0.6

 
 
Tax expense
 
—

 
(0.1
)
 
—

 
(0.2
)
 
 
Net of income taxes
 
—

 
0.2

 
—

 
0.4

Gains and losses on cash flow hedges (Note 9):
 
 
 
 
 
 
 
 
 
 
Interest expense
 
(0.3
)
 
(0.2
)
 
(0.9
)
 
(0.8
)
 
 
Revenue
 
(3.8
)
 
4.9

 
(7.0
)
 
23.4

 
 
Purchased power
 
0.9

 
0.4

 
2.7

 
(0.6
)
 
 
Total before income taxes
 
(3.2
)
 
5.1

 
(5.2
)
 
22.0

 
 
Tax expense
 
1.2

 
(1.9
)
 
1.9

 
(6.7
)
 
 
Net of income taxes
 
(2.0
)
 
3.2

 
(3.3
)
 
15.3

Amortization of defined benefit pension items (Note 7):
 
 
 
 
 
 
 
 
 
 
Reclassification to Other income / (deductions)
 
1.4

 
1.0

 
4.2

 
3.1

 
 
Tax benefit
 
(0.6
)
 
(0.3
)
 
(1.6
)
 
(1.0
)
 
 
Net of income taxes
 
0.8

 
0.7

 
2.6

 
2.1

 
 
 
 
 
 
 
 
 
 
 
Total reclassifications for the period, net of income taxes
 
$
(1.2
)
 
$
4.1

 
$
(0.7
)
 
$
17.8
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The changes in the components of Accumulated Other Comprehensive Income / (Loss) during the nine months ended September 30, 2015 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, 2015
 
$
0.7

 
$
2.8

 
$
(45.8
)
 
$
(42.3
)
 
 
 
 
 
 
 
 
 
Other comprehensive income before reclassifications
 
(0.3
)
 
9.6

 
—

 
9.3

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

 
(3.3
)
 
2.6

 
(0.7
)
Net current period other comprehensive income / (loss)
 
(0.3
)
 
6.3

 
2.6

 
8.6

 
 
 
 
 
 
 
 
 
Balance September 30, 2015
 
$
0.4

 
$
9.1

 
$
(43.2
)
 
$
(33.7
)