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Supplemental Financial Information (Tables)
 3 Months Ended
Mar. 31, 2017
Supplemental Financial Information [Line Items]  
Schedule of Supplemental Financial Information
Accounts receivable and Inventories are as follows at March 31, 2017 and December 31, 2016:
 
 
March 31,
 
December 31,
$ in millions
 
2017
 
2016
Accounts receivable, net:
 
 
 
 
Unbilled revenue

$
14.7

 
$
43.0

Customer receivables
 
68.4

 
73.9

Amounts due from partners in jointly owned plants
 
6.6

 
12.7

Other
 
12.7

 
6.7

Provision for uncollectible accounts
 
(1.0
)
 
(1.2
)
Total accounts receivable, net
 
$
101.4

 
$
135.1

Inventories, at average cost:
 
 
 
 
Fuel and limestone
 
$
38.8

 
$
38.9

Plant materials and supplies
 
20.6

 
36.6

Other
 
1.5

 
1.7

Total inventories, at average cost
 
$
60.9

 
$
77.2
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, 2017 and 2016 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
 
 
 
2017
 
2016
Gains and losses on Available-for-sale securities activity (Note 5):
 
 
 
 
 
 
Other income
 
$
(0.1
)
 
$
(0.1
)
Gains and losses on cash flow hedges (Note 6):
 
 
 
 
 
 
Interest expense
 
(0.3
)
 
(0.2
)
 
 
Revenue
 
(1.5
)
 
(17.2
)
 
 
Purchased power
 
3.3

 
4.4

 
 
Total before income taxes
 
1.5

 
(13.0
)
 
 
Tax expense / (benefit)
 
(0.5
)
 
4.8

 
 
Net of income taxes
 
1.0

 
(8.2
)
Amortization of defined benefit pension items (Note 9):
 
 
 
 
 
 
Operation and maintenance
 
1.3

 
0.1

 
 
Tax benefit
 
(0.5
)
 
(0.1
)
 
 
Net of income taxes
 
0.8

 
—

 
 
 
 
 
 
 
Total reclassifications for the period, net of income taxes
 
$
1.7

 
$
(8.3
)
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, 2017 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, 2017
 
$
0.6

 
$
13.1

 
$
(13.4
)
 
$
0.3

 
 
 
 
 
 
 
 
 
Other comprehensive income / (loss) before reclassifications
 
0.2

 
5.2

 
(1.5
)
 
3.9

Amounts reclassified from accumulated other comprehensive income / (loss)
 
(0.1
)
 
1.0

 
0.8

 
1.7

Net current period other comprehensive income / (loss)
 
0.1

 
6.2

 
(0.7
)
 
5.6

 
 
 
 
 
 
 
 
 
Balance March 31, 2017
 
$
0.7

 
$
19.3

 
$
(14.1
)
 
$
5.9
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, 2017 and December 31, 2016:
 
 
March 31,
 
December 31,
$ in millions
 
2017
 
2016
Accounts receivable, net:
 
 
 
 
Unbilled revenue
 
$
14.7

 
$
43.0

Customer receivables
 
65.2

 
71.2

Amounts due from partners in jointly owned plants
 
6.6

 
12.7

Amounts due from affiliates
 
14.8

 
2.9

Other
 
10.3

 
6.0

Provision for uncollectible accounts
 
(1.0
)
 
(1.2
)
Total accounts receivable, net
 
$
110.6

 
$
134.6

 
 
 
 
 
Inventories, at average cost:
 
 
 
 
Fuel and limestone
 
$
38.8

 
$
38.8

Plant materials and supplies
 
19.2

 
35.3

Other
 
1.5

 
1.7

Total inventories, at average cost
 
$
59.5

 
$
75.8
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, 2017 and 2016 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
 
 
 
2017
 
2016
Gains and losses on Available-for-sale securities activity (Note 5):
 
 
 
 
 
 
Other income
 
$
(0.1
)
 
$
(0.1
)
Gains and losses on cash flow hedges (Note 6):
 
 
 
 
 
 
Interest expense
 
(0.3
)
 
(0.3
)
 
 
Revenue
 
(1.5
)
 
(17.1
)
 
 
Purchased power
 
3.3

 
4.4

 
 
Total before income taxes
 
1.5

 
(13.0
)
 
 
Tax expense / (benefit)
 
(0.5
)
 
4.6

 
 
Net of income taxes
 
1.0

 
(8.4
)
Amortization of defined benefit pension items (Note 9):
 
 
 
 
 
 
Operation and maintenance
 
3.8

 
1.1

 
 
Tax benefit
 
(1.3
)
 
(0.8
)
 
 
Net of income taxes
 
2.5

 
0.3

 
 
 
 
 
 
 
Total reclassifications for the period, net of income taxes
 
$
3.4

 
$
(8.2
)
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, 2017 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, 2017
 
$
0.7

 
$
(2.7
)
 
$
(40.5
)
 
$
(42.5
)
 
 
 
 
 
 
 
 
 
Other comprehensive income / (loss) before reclassifications
 
0.2

 
5.2

 
(1.6
)
 
3.8

Amounts reclassified from accumulated other comprehensive income / (loss)
 
(0.1
)
 
1.0

 
2.5

 
3.4

Net current period other comprehensive income
 
0.1

 
6.2

 
0.9

 
7.2

 
 
 
 
 
 
 
 
 
Balance March 31, 2017
 
$
0.8

 
$
3.5

 
$
(39.6
)
 
$
(35.3
)