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Supplemental Financial Information (Tables)
 12 Months Ended
Dec. 31, 2016
Supplemental Financial Information [Line Items]  
Schedule of Supplemental Financial Information
 
 
December 31,
$ in millions
 
2016
 
2015
Accounts receivable, net
 
 
 
 
Unbilled revenue
 
$
43.0

 
$
43.3

Customer receivables
 
73.9

 
56.4

Amounts due from partners in jointly-owned stations
 
12.7

 
16.0

Other
 
6.7

 
6.0

Provisions for uncollectible accounts
 
(1.2
)
 
(0.8
)
Total accounts receivable, net
 
$
135.1

 
$
120.9

 
 
 
 
 
Inventories
 
 
 
 
Fuel and limestone
 
$
38.9

 
$
72.2

Plant materials and supplies
 
36.6

 
34.9

Other
 
1.7

 
2.0

Total inventories, at average cost
 
$
77.2

 
$
109.1
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
The amounts reclassified out of Accumulated Other Comprehensive Income / (Loss) by component during the years ended December 31, 2016, 2015 and 2014 are as follows:
Details about Accumulated Other Comprehensive Income / (Loss) Components
 
Affected line item in the Consolidated Statements of Operations
 
Years ended December 31,
$ in millions
 
 
 
2016
 
2015
 
2014
Gains and losses on Available-for-sale securities activity (Note 5):
 
 
 
 
 
 
 
 
Other income
 
$
—

 
$
—

 
$
0.4

 
 
Tax expense
 
—

 
—

 
(0.2
)
 
 
Net of income taxes
 
—

 
—

 
0.2

 
 
 
 
 
 
 
 
 
Gains and losses on cash flow hedges (Note 6):
 
 
 
 
 
 
 
 
Interest Expense
 
(1.0
)
 
(1.1
)
 
(1.3
)
 
 
Revenue
 
(55.3
)
 
(18.7
)
 
28.4

 
 
Purchased power
 
9.9

 
4.4

 
(0.7
)
 
 
Total before income taxes
 
(46.4
)
 
(15.4
)
 
26.4

 
 
Tax benefit / (expense)
 
16.7

 
5.4

 
(9.5
)
 
 
Net of income taxes
 
(29.7
)
 
(10.0
)
 
16.9

 
 
 
 
 
 
 
 
 
Amortization of defined benefit pension items (Note 10):
 
 
 
 
 
 
 
 
Operations and maintenance
 
1.6

 
0.4

 
—

 
 
Tax expense
 
(0.6
)
 
(0.2
)
 
—

 
 
Net of income taxes
 
1.0

 
0.2

 
—

 
 
 
 
 
 
 
 
 
Total reclassifications for the period, net of income taxes
 
$
(28.7
)
 
$
(9.8
)
 
$
17.1
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The changes in the components of Accumulated Other Comprehensive Income / (Loss) during the years ended December 31, 2016 and 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 at December 31, 2014
 
$
0.5

 
$
18.5

 
$
(11.5
)
 
$
7.5

 
 
 
 
 
 
 
 
 
Other comprehensive income / (loss) before reclassifications
 
(0.1
)
 
18.2

 
1.6

 
19.7

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

 
(10.0
)
 
0.2

 
(9.8
)
Net current period other comprehensive income / (loss)
 
(0.1
)
 
8.2

 
1.8

 
9.9

 
 
 
 
 
 
 
 
 
Balance at December 31, 2015
 
0.4

 
26.7

 
(9.7
)
 
17.4

 
 
 
 
 
 
 
 
 
Other comprehensive income / (loss) before reclassifications
 
0.2

 
16.1

 
(4.7
)
 
11.6

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

 
(29.7
)
 
1.0

 
(28.7
)
Net current period other comprehensive income / (loss)
 
0.2

 
(13.6
)
 
(3.7
)
 
(17.1
)
 
 
 
 
 
 
 
 
 
Balance at December 31, 2016
 
$
0.6

 
$
13.1

 
$
(13.4
)
 
$
0.3
THE DAYTON POWER AND LIGHT COMPANY [Member]  
Supplemental Financial Information [Line Items]  
Schedule of Supplemental Financial Information
Supplemental Financial Information
 
 
December 31,
$ in millions
 
2016
 
2015
Accounts receivable, net
 
 
 
 
Unbilled revenue
 
$
43.0

 
$
43.3

Customer receivables
 
71.2

 
54.1

Amounts due from partners in jointly-owned stations
 
12.7

 
16.0

Other
 
8.9

 
6.9

Provisions for uncollectible accounts
 
(1.2
)
 
(0.8
)
Total accounts receivable, net
 
$
134.6

 
$
119.5

 
 
 
 
 
Inventories
 
 
 
 
Fuel and limestone
 
$
38.8

 
$
72.2

Plant materials and supplies
 
35.3

 
33.7

Other
 
1.7

 
2.1

Total inventories, at average cost
 
$
75.8

 
$
108.0
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
The amounts reclassified out of Accumulated Other Comprehensive Income / (Loss) by component during the years ended December 31, 2016, 2015 and 2014 are as follows:
Details about Accumulated Other Comprehensive Income / (Loss) Components
 
Affected line item in the Statements of Operations
 
Years ended December 31,
$ in millions
 
 
 
2016
 
2015
 
2014
Gains and losses on Available-for-sale securities activity (Note 5):
 
 
 
 
 
 
 
 
Other income
 
$
—

 
$
—

 
$
0.4

 
 
Tax expense
 
—

 
—

 
(0.2
)
 
 
Net of income taxes
 
—

 
—

 
0.2

Gains and losses on cash flow hedges (Note 6):
 
 
 
 
 
 
 
 
Interest expense
 
(1.0
)
 
(1.1
)
 
(1.1
)
 
 
Revenue
 
(55.3
)
 
(18.7
)
 
28.4

 
 
Purchased power
 
9.9

 
4.4

 
(0.4
)
 
 
Total before income taxes
 
(46.4
)
 
(15.4
)
 
26.9

 
 
Tax benefit / (expense)
 
16.4

 
5.6

 
(11.5
)
 
 
Net of income taxes
 
(30.0
)
 
(9.8
)
 
15.4

Amortization of defined benefit pension items (Note 9):
 
 
 
 
 
 
 
 
Operation and maintenance
 
7.7

 
5.6

 
4.1

 
 
Tax expense
 
(1.8
)
 
(1.9
)
 
(1.4
)
 
 
Net of income taxes
 
5.9

 
3.7

 
2.7

 
 
 
 
 
 
 
 
 
Total reclassifications for the period, net of income taxes
 
$
(24.1
)
 
$
(6.1
)
 
$
18.3
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The changes in the components of Accumulated Other Comprehensive Income / (Loss) during the years ended December 31, 2016 and 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 at December 31, 2014
 
$
0.7

 
$
2.8

 
$
(45.8
)
 
$
(42.3
)
 
 
 
 
 
 
 
 
 
Other comprehensive income / (loss) before reclassifications
 
(0.2
)
 
18.2

 
1.7

 
19.7

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

 
(9.8
)
 
3.7

 
(6.1
)
Net current period other comprehensive income / (loss)
 
(0.2
)
 
8.4

 
5.4

 
13.6

 
 
 
 
 
 
 
 
 
Balance at December 31, 2015
 
0.5

 
11.2

 
(40.4
)
 
(28.7
)
 
 
 
 
 
 
 
 
 
Other comprehensive income / (loss) before reclassifications
 
0.2

 
16.1

 
(6.0
)
 
10.3

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

 
(30.0
)
 
5.9

 
(24.1
)
Net current period other comprehensive income / (loss)
 
0.2

 
(13.9
)
 
(0.1
)
 
(13.8
)
 
 
 
 
 
 
 
 
 
Balance at December 31, 2016
 
$
0.7

 
$
(2.7
)
 
$
(40.5
)
 
$
(42.5
)