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LEASES - Estimated Future Commitments Under Operating Leases (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Lessee, Lease, Description [Line Items]  
2019 $ 24.2
2020 20.7
2021 18.4
2022 15.2
2023 12.4
After 2023 95.0
Total operating lease payments 185.9
Westar Energy  
Lessee, Lease, Description [Line Items]  
2019 14.0
2020 10.1
2021 8.1
2022 5.2
2023 2.8
After 2023 3.1
Total operating lease payments 43.3
KCP&L  
Lessee, Lease, Description [Line Items]  
2019 10.2
2020 10.6
2021 10.3
2022 10.0
2023 9.6
After 2023 91.8
Total operating lease payments $ 142.5