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Commitments and Contingencies (Tables)
 3 Months Ended
Mar. 31, 2016
Commitments and Contingencies Disclosure [Abstract]  
Schedule Of Environmental Capital Expenditures [Table Text Block]
 
2016
2017
2018
2019
2020
 
(millions)
Great Plains Energy
$
99.6

$
45.5

$
20.6

$
98.9

$
151.9

KCP&L
83.8

30.1

14.4

87.3

130.0