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LEASES - Schedule of Lease Expense (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2019
USD ($)
Finance lease costs  
Amortization of right-of-use assets $ 1.1
Interest on lease liabilities 0.7
Operating lease costs 6.4
Short-term lease costs 0.8
Variable lease costs for renewable purchase power agreements 73.9
Total lease costs 82.9
Westar Energy  
Finance lease costs  
Amortization of right-of-use assets 1.0
Interest on lease liabilities 0.6
Operating lease costs 3.8
Short-term lease costs 0.1
Variable lease costs for renewable purchase power agreements 32.2
Total lease costs 37.7
KCP&L  
Finance lease costs  
Amortization of right-of-use assets 0.0
Interest on lease liabilities 0.0
Operating lease costs 2.3
Short-term lease costs 0.7
Variable lease costs for renewable purchase power agreements 29.1
Total lease costs $ 32.1