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Benefit Plans (Estimated Future Benefit Payments and Medicare Part D Reimbursements) (Details) - Pension [Member]
$ in Millions
Dec. 31, 2016
USD ($)
2016 $ 25.0
2017 25.5
2018 26.0
2019 26.4
2020 26.7
2021 - 2025 139.6
THE DAYTON POWER AND LIGHT COMPANY [Member]  
2016 25.0
2017 25.5
2018 26.0
2019 26.4
2020 26.7
2021 - 2025 $ 139.6