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LEASES - Estimated Future Commitments Under Finance Leases (Details) $ in Millions	Dec. 31, 2018 USD ($)
Lessee, Lease, Description [Line Items]
2019	$ 6.4
2020	5.8
2021	5.3
2022	4.7
2023	4.0
After 2023	48.6
Total finance lease payments	74.8
Amounts representing imputed interest	(25.8)
Present value of net minimum lease payments under finance leases	49.0
Less: current portion	(3.9)
Total long-term obligations under finance leases	45.1
Westar Energy
Lessee, Lease, Description [Line Items]
2019	6.0
2020	5.4
2021	4.9
2022	4.3
2023	3.6
After 2023	46.4
Total finance lease payments	70.6
Amounts representing imputed interest	(24.6)
Present value of net minimum lease payments under finance leases	46.0
Less: current portion	(3.7)
Total long-term obligations under finance leases	42.3
KCP&L
Lessee, Lease, Description [Line Items]
2019	0.2
2020	0.2
2021	0.2
2022	0.2
2023	0.2
After 2023	1.1
Total finance lease payments	2.1
Amounts representing imputed interest	(0.6)
Present value of net minimum lease payments under finance leases	1.5
Less: current portion	(0.1)
Total long-term obligations under finance leases	$ 1.4

X

- Definition

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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Amount of minimum lease payments for capital leases due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount necessary to reduce net minimum lease payments to present value for capital leases.

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