XML 32 R51.htm IDEA: XBRL DOCUMENT v3.20.1
Shareholder's Equity (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Class of Stock [Line Items]      
Non-cash capital contribution $ 0.0 $ 1.5  
Common Stock, Shares Authorized 1,500 1,500 1,500
Common stock, shares outstanding 1   1
THE DAYTON POWER AND LIGHT COMPANY [Member]      
Class of Stock [Line Items]      
Common Stock, Shares Authorized 50,000,000 50,000,000 50,000,000
Par value common shares (in USD per share) $ 0.01 $ 0.01 $ 0.01
Common stock, shares outstanding 41,172,173   41,172,173