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Debt (Long-term Debt) (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Feb. 05, 2016
Sep. 30, 2016
Dec. 31, 2015
Mar. 31, 2017
Debt Instrument [Line Items]        
Unamortized deferred finance costs   $ (5.6) $ (5.0)  
Unamortized deferred finance costs   (9.3) (11.1)  
Unamortized debt discount and premiums, net   (0.6) (0.7)  
Total long-term debt at subsidiary   746.3 754.5  
Total long-term debt   1,914.0 1,993.3  
Less: current portion   (79.2) (572.8)  
Long-term debt   $ 1,834.8 1,420.5  
Long-term debt, earliest maturities   2016    
Long-term debt, latest maturities   2061    
THE DAYTON POWER AND LIGHT COMPANY [Member]        
Debt Instrument [Line Items]        
Unamortized deferred finance costs   $ (12.3) (6.2)  
Unamortized debt discount and premiums, net   (11.1) (3.6)  
Unamortized debt discount   (2.2) (0.2)  
Total long-term debt   748.5 756.7  
Less: current portion   (3.5) (443.1)  
Long-term debt   $ 745.0 313.6  
Long-term debt, earliest maturities   2016    
Long-term debt, latest maturities   2061    
Term Loan Maturing 2022 [Domain]        
Debt Instrument [Line Items]        
Debt instrument maturity year   Aug. 24, 2022    
Term Loan Maturing 2022 [Domain] | THE DAYTON POWER AND LIGHT COMPANY [Member]        
Debt Instrument [Line Items]        
Debt instrument maturity year   Aug. 24, 2022    
Term Loan Maturing 2022 [Member]        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 445.0 $ 0.0  
Debt Instrument, Basis Spread on Variable Rate   3.25%    
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Minimum   4.00%    
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Minimum   0.75%    
Debt instrument interest percentage maximum   4.00%    
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Maximum      
Term Loan Maturing 2022 [Member] | THE DAYTON POWER AND LIGHT COMPANY [Member]        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 445.0 $ 0.0  
Debt Instrument, Basis Spread on Variable Rate   3.25%    
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Minimum   4.00%    
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Minimum   0.75%    
Debt instrument interest percentage maximum   4.00%    
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Maximum      
One Point Nine Percentage Of First Mortgage Bonds Maturing September Two Thousand Sixteen [Member]        
Debt Instrument [Line Items]        
Long-term debt, gross     $ 445.0  
Debt instrument maturity year   Sep. 01, 2016    
Debt instrument interest percentage   1.875% 1.875%  
One Point Nine Percentage Of First Mortgage Bonds Maturing September Two Thousand Sixteen [Member] | THE DAYTON POWER AND LIGHT COMPANY [Member]        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 0.0 $ 445.0  
Debt instrument maturity year   Sep. 01, 2016    
Debt instrument interest percentage   1.875% 1.875%  
Pollution Control Series Maturing in September 2036 - 4.80% [Member]        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 100.0 $ 100.0  
Debt instrument maturity year   Sep. 01, 2036    
Debt instrument interest percentage   4.80%    
Pollution Control Series Maturing in September 2036 - 4.80% [Member] | THE DAYTON POWER AND LIGHT COMPANY [Member]        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 100.0 $ 100.0  
Debt instrument maturity year   Sep. 01, 2036    
Debt instrument interest percentage   4.80%    
Pollution Control Series Maturing in August 2020 - 1.13% - 1.14% [Member]        
Debt Instrument [Line Items]        
Debt instrument maturity year   Aug. 01, 2020    
Debt instrument interest percentage minimum     1.13%  
Debt instrument interest percentage maximum     1.17%  
Pollution Control Series Maturing in August 2020 - 1.13% - 1.14% [Member] | THE DAYTON POWER AND LIGHT COMPANY [Member]        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 200.0 $ 200.0  
Debt instrument maturity year   Aug. 01, 2020    
Zero Point Two Three To Zero Point Two Nine And Zero Point One Six To Zero Point Three Six Percentage Of Pollution Control Series Maturing In November Two Thousand Forty [Member]        
Debt Instrument [Line Items]        
Debt instrument interest percentage minimum   1.29%    
Debt instrument interest percentage maximum   1.36%    
Zero Point Two Three To Zero Point Two Nine And Zero Point One Six To Zero Point Three Six Percentage Of Pollution Control Series Maturing In November Two Thousand Forty [Member] | THE DAYTON POWER AND LIGHT COMPANY [Member]        
Debt Instrument [Line Items]        
Debt instrument interest percentage minimum   1.29% 1.13%  
Debt instrument interest percentage maximum   1.36% 1.17%  
U.S. Government note maturing in February 2061 - 4.20% [Member]        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 18.0 $ 18.1  
Debt instrument maturity year   Feb. 01, 2061    
Debt instrument interest percentage   4.20%    
U.S. Government note maturing in February 2061 - 4.20% [Member] | THE DAYTON POWER AND LIGHT COMPANY [Member]        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 18.0 18.1  
Debt instrument maturity year   Feb. 01, 2061    
Debt instrument interest percentage   4.20%    
Bank term loan due in July 2020 - rates from: 2.44% - 2.45% [Member]        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 125.0 $ 125.0  
Debt instrument maturity year   Jul. 31, 2020    
Debt instrument interest percentage minimum   2.67% 2.44%  
Debt instrument interest percentage maximum   2.77% 2.67%  
Senior unsecured due in October 2016 - 6.5% [Member]        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 57.0 $ 130.0  
Debt Instrument, Basis Spread on Variable Rate 0.50%      
Debt instrument maturity year   Oct. 01, 2016    
Debt instrument interest percentage   6.50% 6.50%  
Senior unsecured due in October 2019 - 6.75% [Member]        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 200.0 $ 200.0  
Debt instrument maturity year   Oct. 01, 2019    
Debt instrument interest percentage   6.75%    
Senior unsecured due in October 2021 - 7.25% [Member]        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 780.0 780.0  
Debt instrument maturity year   Oct. 01, 2021    
Debt instrument interest percentage   7.25%    
Note to DPL Capital Trust II Maturing in September 2031 - 8.125% [Member]        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 15.6 $ 15.6  
Debt instrument maturity year   Sep. 01, 2031    
Debt instrument interest percentage   8.125%    
Subsequent Event [Member] | Term Loan Maturing 2022 [Member]        
Debt Instrument [Line Items]        
Quarterly Loan Amortization of Initial Principal Balance       0.25%
Subsequent Event [Member] | Term Loan Maturing 2022 [Member] | THE DAYTON POWER AND LIGHT COMPANY [Member]        
Debt Instrument [Line Items]        
Quarterly Loan Amortization of Initial Principal Balance       0.25%