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Supplemental Financial Information
 9 Months Ended
Sep. 30, 2017
Supplemental Financial Information [Line Items]  
Supplemental Financial Information
Supplemental Financial Information

Accounts receivable and Inventories are as follows at September 30, 2017 and December 31, 2016:
 
 
September 30,
 
December 31,
$ in millions
 
2017
 
2016
Accounts receivable, net:
 
 
 
 
Unbilled revenue

$
14.4

 
$
43.0

Customer receivables
 
74.2

 
73.9

Amounts due from partners in jointly-owned plants
 
17.8

 
12.7

Other
 
6.1

 
6.7

Provision for uncollectible accounts
 
(1.1
)
 
(1.2
)
Total accounts receivable, net
 
$
111.4

 
$
135.1

 
 
 
 
 
Inventories, at average cost:
 
 
 
 
Fuel and limestone
 
$
16.8

 
$
38.9

Plant materials and supplies
 
10.9

 
36.6

Other
 
1.0

 
1.7

Total inventories, at average cost
 
$
28.7

 
$
77.2



Accumulated Other Comprehensive Income / (Loss)
The amounts reclassified out of Accumulated Other Comprehensive Income / (Loss) by component during the three and nine months ended September 30, 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
 
Nine months ended
 
 
 
 
September 30,
 
September 30,
$ in millions
 
 
 
2017
 
2016
 
2017
 
2016
Gains and losses on Available-for-sale securities activity (Note 5):
 
 
Other income
 
$
—

 
$
—

 
$
(0.1
)
 
$
—

 
 
 
 
 
 
 
 
 
 
 
Gains and losses on cash flow hedges (Note 6):
 
 
 
 
 
 
 
 
 
 
Interest expense
 
(0.2
)
 
(0.2
)
 
(0.8
)
 
(0.7
)
 
 
Revenue
 
(4.2
)
 
(9.3
)
 
(12.5
)
 
(46.6
)
 
 
Purchased power
 
0.7

 
1.0

 
4.0

 
9.1

 
 
Total before income taxes
 
(3.7
)
 
(8.5
)
 
(9.3
)
 
(38.2
)
 
 
Tax expense
 
1.3

 
3.0

 
3.3

 
13.8

 
 
Net of income taxes
 
(2.4
)
 
(5.5
)
 
(6.0
)
 
(24.4
)
 
 
 
 
 
 
 
 
 
 
 
Amortization of defined benefit pension items (Note 9):
 
 
 
 
 
 
 
 
 
 
Operation and maintenance
 
—

 
—

 
1.4

 
0.2

 
 
Tax benefit
 
—

 
—

 
(0.5
)
 
(0.1
)
 
 
Net of income taxes
 
—

 
—

 
0.9

 
0.1

 
 
 
 
 
 
 
 
 
 
 
Total reclassifications for the period, net of income taxes
 
$
(2.4
)
 
$
(5.5
)
 
$
(5.2
)
 
$
(24.3
)



The changes in the components of Accumulated Other Comprehensive Income / (Loss) during the nine months ended September 30, 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 at January 1, 2017
 
$
0.6

 
$
13.1

 
$
(13.4
)
 
$
0.3

 
 
 
 
 
 
 
 
 
Other comprehensive income / (loss) before reclassifications
 
0.4

 
12.1

 
(1.5
)
 
11.0

Amounts reclassified from accumulated other comprehensive income / (loss)
 
(0.1
)
 
(6.0
)
 
0.9

 
(5.2
)
Net current period other comprehensive income / (loss)
 
0.3

 
6.1

 
(0.6
)
 
5.8

 
 
 
 
 
 
 
 
 
Balance at September 30, 2017
 
$
0.9

 
$
19.2

 
$
(14.0
)
 
$
6.1
THE DAYTON POWER AND LIGHT COMPANY [Member]  
Supplemental Financial Information [Line Items]  
Supplemental Financial Information
Supplemental Financial Information

Accounts receivable and Inventories are as follows at September 30, 2017 and December 31, 2016:
 
 
September 30,
 
December 31,
$ in millions
 
2017
 
2016
Accounts receivable, net:
 
 
 
 
Unbilled revenue
 
$
14.4

 
$
43.0

Customer receivables
 
68.7

 
71.2

Amounts due from affiliates
 
2.3

 
2.9

Amounts due from partners in jointly-owned plants
 
17.8

 
12.7

Other
 
5.8

 
6.0

Provision for uncollectible accounts
 
(1.1
)
 
(1.2
)
Total accounts receivable, net
 
$
107.9

 
$
134.6

 
 
 
 
 
Inventories, at average cost:
 
 
 
 
Fuel and limestone
 
$
16.8

 
$
38.8

Plant materials and supplies
 
9.1

 
35.3

Other
 
1.0

 
1.7

Total inventories, at average cost
 
$
26.9

 
$
75.8



Accumulated Other Comprehensive Income / (Loss)
The amounts reclassified out of Accumulated Other Comprehensive Income / (Loss) by component during the three and nine months ended September 30, 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
 
Nine months ended
 
 
 
 
September 30,
 
September 30,
$ in millions
 
 
 
2017
 
2016
 
2017
 
2016
Gains and losses on Available-for-sale securities activity (Note 5):
 
 
Other income
 
$
—

 
$
—

 
$
(0.1
)
 
$
—

 
 
 
 
 
 
 
 
 
 
 
Gains and losses on cash flow hedges (Note 6):
 
 
 
 
 
 
 
 
 
 
Interest expense
 
(0.3
)
 
(0.3
)
 
(0.8
)
 
(0.9
)
 
 
Revenue
 
(4.2
)
 
(9.3
)
 
(12.5
)
 
(46.5
)
 
 
Purchased power
 
0.7

 
1.0

 
4.0

 
9.1

 
 
Total before income taxes
 
(3.8
)
 
(8.6
)
 
(9.3
)
 
(38.3
)
 
 
Tax expense
 
1.4

 
3.0

 
3.3

 
13.5

 
 
Net of income taxes
 
(2.4
)
 
(5.6
)
 
(6.0
)
 
(24.8
)
 
 
 
 
 
 
 
 
 
 
 
Amortization of defined benefit pension items (Note 9):
 
 
 
 
 
 
 
 
 
 
Operation and maintenance
 
1.1

 
1.1

 
5.9

 
3.3

 
 
Tax benefit
 
(0.4
)
 
(0.4
)
 
(2.1
)
 
(1.6
)
 
 
Net of income taxes
 
0.7

 
0.7

 
3.8

 
1.7

 
 
 
 
 
 
 
 
 
 
 
Total reclassifications for the period, net of income taxes
 
$
(1.7
)
 
$
(4.9
)
 
$
(2.3
)
 
$
(23.1
)


The changes in the components of Accumulated Other Comprehensive Income / (Loss) during the nine months ended September 30, 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 at January 1, 2017
 
$
0.7

 
$
(2.7
)
 
$
(40.5
)
 
$
(42.5
)
 
 
 
 
 
 
 
 
 
Other comprehensive income / (loss) before reclassifications
 
0.4

 
12.1

 
(1.6
)
 
10.9

Amounts reclassified from accumulated other comprehensive income / (loss)
 
(0.1
)
 
(6.0
)
 
3.8

 
(2.3
)
Net current period other comprehensive income
 
0.3

 
6.1

 
2.2

 
8.6

 
 
 
 
 
 
 
 
 
Balance at September 30, 2017
 
$
1.0

 
$
3.4

 
$
(38.3
)
 
$
(33.9
)