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Regulatory Matters (Details) - USD ($) $ in Millions	12 Months Ended
Regulatory Matters (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Regulatory Assets, Noncurrent	$ 176.8	$ 193.6
RSC Rider	79.0
Recovery of Smart Grid Plan Phase 1 capital investments	249.0
COVID-19 Deferral [Member]
Regulatory Assets, Noncurrent	0.9	1.2
THE DAYTON POWER AND LIGHT COMPANY [Member]
Regulatory Assets, Noncurrent	176.8	193.6
RSC Rider	79.0
Recovery of Smart Grid Plan Phase 1 capital investments	249.0
THE DAYTON POWER AND LIGHT COMPANY [Member] \| COVID-19 Deferral [Member]
Regulatory Assets, Noncurrent	$ 0.9	$ 1.2