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Consolidated Statements of Comprehensive Income/(Loss) (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income tax (expense)/benefit on unrealized gains (losses) related to available-for-sale securities $ 0.0 $ (0.2) $ (0.1)
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Tax 0.6 0.0 0.0
Income tax (expense)/benefit on unrealized gains (losses) related to derivative activity 0.1 (5.3) (8.8)
Income tax (expense)/benefit on reclassification of earnings related to derivative activity 0.4 0.3 0.5
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives Related to Discontinued Operations, Tax (1.2) 4.1 16.2
Income tax (expense)/benefit on prior service cost related to pension and postretirement activity 0.6 0.4 0.0
Income tax (expense)/benefit on net loss related to pension and postretirement activity (0.5) 1.1 2.4
Income tax (expense)/benefit on reclassification of earnings related to pension and postretirement activity (0.2) (0.5) (0.6)
THE DAYTON POWER AND LIGHT COMPANY [Member]      
Income tax (expense)/benefit on unrealized gains (losses) related to available-for-sale securities 0.0 (0.2) (0.1)
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Tax 0.0 0.0 0.0
Income tax (expense)/benefit on unrealized gains (losses) related to derivative activity 0.1 (7.2) (8.7)
Income tax (expense)/benefit on reclassification of earnings related to derivative activity 0.4 0.2 0.2
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives Related to Discontinued Operations, Tax 0.0 3.0 16.2
Income tax (expense)/benefit on prior service cost related to pension and postretirement activity 0.6 1.0 0.0
Income tax (expense)/benefit on net loss related to pension and postretirement activity (0.4) 0.4 1.1
Income tax (expense)/benefit on reclassification of earnings related to pension and postretirement activity $ (1.0) $ (2.3) $ (1.8)