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PENSION PLANS AND POST-RETIREMENT BENEFITS (Tables)

12 Months Ended

Dec. 31, 2020

Retirement Benefits [Abstract]

Schedule of Net Funded Status

Evergy Metro amounts are only included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

			Pension Benefits																		Post-Retirement Benefits
			Evergy						Evergy Kansas Central						Evergy Metro						Evergy						Evergy Kansas Central						Evergy Metro
Change in projected benefit obligation (PBO)			(millions)
PBO at January 1, 2020			$	2,718.2					$	1,323.4					$	1,371.4					$	264.3					$	138.7					$	125.6
Service cost			78.9						27.1						51.8						2.7						1.1						1.6
Interest cost			96.8						47.0						49.1						9.2						4.8						4.4
Contribution by participants			—						—						—						9.3						1.8						7.5
Plan amendments			4.2						8.1						(3.9)						1.0						0.5						0.5
Actuarial loss			273.9						127.0						144.8						19.6						11.0						8.6
Benefits paid			(202.5)						(102.3)						(99.0)						(25.7)						(11.1)						(14.6)
Settlements			(62.9)						—						(62.9)						—						—						—
Other			(5.5)						(0.7)						(4.8)						—						—						—
PBO at December 31, 2020			$	2,901.1					$	1,429.6					$	1,446.5					$	280.4					$	146.8					$	133.6
Change in plan assets
Fair value of plan assets at January 1, 2020			$	1,732.8					$	842.1					$	890.7					$	239.9					$	120.5					$	119.4
Actual return on plan assets			209.9						99.7						110.2						20.7						13.7						7.0
Contributions by employer and participants			123.4						45.8						77.6						11.7						2.1						9.6
Benefits paid			(198.6)						(99.9)						(98.7)						(24.0)						(10.5)						(13.5)
Settlements			(62.9)						—						(62.9)						—						—						—
Other			(5.5)						(0.7)						(4.8)						—						—						—
Fair value of plan assets at December 31, 2020			$	1,799.1					$	887.0					$	912.1					$	248.3					$	125.8					$	122.5
Funded status at December 31, 2020			$	(1,102.0)					$	(542.6)					$	(534.4)					$	(32.1)					$	(21.0)					$	(11.1)

						Pension Benefits																		Post-Retirement Benefits
						Evergy						Evergy Kansas Central						Evergy Metro						Evergy						Evergy Kansas Central						Evergy Metro
Change in projected benefit obligation (PBO)						(millions)
PBO at January 1, 2019						$	2,553.4					$	1,258.9					$	1,272.4					$	249.3					$	133.6					$	115.7
Service cost						79.1						29.0						50.1						2.5						1.1						1.4
Interest cost						108.0						53.7						53.3						10.5						5.6						4.9
Contribution by participants						—						—						—						8.8						1.9						6.9
Actuarial loss						262.4						120.3						140.5						20.9						9.5						11.4
Benefits paid						(180.5)						(136.9)						(42.3)						(27.7)						(13.0)						(14.7)
Settlements						(96.6)						—						(96.6)						—						—						—
Other						(7.6)						(1.6)						(6.0)						—						—						—
PBO at December 31, 2019						$	2,718.2					$	1,323.4					$	1,371.4					$	264.3					$	138.7					$	125.6
Change in plan assets
Fair value of plan assets at January 1, 2019						$	1,603.4					$	804.6					$	798.8					$	223.3					$	109.7					$	113.6
Actual return on plan assets						284.0						130.5						153.5						30.0						20.0						10.0
Contributions by employer and participants						125.2						43.0						82.2						13.2						3.5						9.7
Benefits paid						(175.6)						(134.4)						(41.2)						(26.6)						(12.7)						(13.9)
Settlements						(96.6)						—						(96.6)						—						—						—
Other						(7.6)						(1.6)						(6.0)						—						—						—
Fair value of plan assets at December 31, 2019						$	1,732.8					$	842.1					$	890.7					$	239.9					$	120.5					$	119.4
Funded status at December 31, 2019						$	(985.4)					$	(481.3)					$	(480.7)					$	(24.4)					$	(18.2)					$	(6.2)

Schedule of Amounts Recognized in Balance Sheet

			Pension Benefits																		Post-Retirement Benefits
			Evergy						Evergy Kansas Central						Evergy Metro						Evergy						Evergy Kansas Central						Evergy Metro
Amounts recognized in the consolidated balance sheets															(millions)
Non-current asset			$	—					$	—					$	—					$	21.3					$	—					$	21.3
Current pension and other post-retirement liability			(4.4)						(2.5)						(0.8)						(1.6)						(0.8)						(0.9)
Noncurrent pension liability and other post-retirement liability			(1,097.6)						(540.1)						(533.6)						(51.8)						(20.2)						(31.5)
Net amount recognized before regulatory treatment			(1,102.0)						(542.6)						(534.4)						(32.1)						(21.0)						(11.1)
Accumulated OCI or regulatory asset/liability			566.9						408.0						216.9						4.0						1.0						(7.7)
Net amount recognized at December 31, 2020			$	(535.1)					$	(134.6)					$	(317.5)					$	(28.1)					$	(20.0)					$	(18.8)
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Actuarial (gain) loss			$	551.8					$	388.9					$	218.6					$	2.2					$	(0.3)					$	—
Prior service cost			15.1						19.1						(1.7)						1.8						1.3						(7.7)
Net amount recognized at December 31, 2020			$	566.9					$	408.0					$	216.9					$	4.0					$	1.0					$	(7.7)

						Pension Benefits																		Post-Retirement Benefits
						Evergy						Evergy Kansas Central						Evergy Metro						Evergy						Evergy Kansas Central						Evergy Metro
Amounts recognized in the consolidated balance sheets																		(millions)
Non-current asset						$	—					$	—					$	—					$	15.0					$	—					$	15.0
Current pension and other post-retirement liability						(5.6)						(3.0)						(1.3)						(1.9)						(1.0)						(0.9)
Noncurrent pension liability and other post- retirement liability						(979.8)						(478.3)						(479.4)						(37.5)						(17.2)						(20.3)
Net amount recognized before regulatory treatment						(985.4)						(481.3)						(480.7)						(24.4)						(18.2)						(6.2)
Accumulated OCI or regulatory asset/liability						454.1						354.9						192.3						(4.4)						(2.9)						(13.0)
Net amount recognized at December 31, 2019						$	(531.3)					$	(126.4)					$	(288.4)					$	(28.8)					$	(21.1)					$	(19.2)
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Actuarial (gain) loss						$	439.7					$	342.3					$	189.4					$	(5.7)					$	(4.2)					$	(4.9)
Prior service cost						14.4						12.6						2.9						1.3						1.3						(8.1)
Net amount recognized at December 31, 2019						$	454.1					$	354.9					$	192.3					$	(4.4)					$	(2.9)					$	(13.0)

Actuarial losses for the Evergy Companies' pension benefit plans for 2020 and 2019 were primarily driven by a decrease in the discount rate used to measure the benefit obligation of approximately 70 basis points in each of 2020 and 2019 as a result of lower market interest rates.

Schedule of Net Benefit Costs

The assets in the aforementioned trusts are not included in the table above. See Note 14 for more information on these amounts.

						Pension Benefits																		Post-Retirement Benefits
Year Ended December 31, 2020						Evergy						Evergy Kansas Central						Evergy Metro						Evergy						Evergy Kansas Central						Evergy Metro
Components of net periodic benefit costs						(millions)
Service cost						$	78.9					$	27.1					$	51.8					$	2.7					$	1.1					$	1.6
Interest cost						96.8						47.0						49.1						9.2						4.8						4.4
Expected return on plan assets						(105.6)						(53.1)						(54.7)						(9.3)						(6.6)						(2.7)
Prior service cost						1.8						1.6						0.8						0.5						0.5						—
Recognized net actuarial (gain) loss						46.4						33.9						45.7						0.2						—						(0.6)
Settlement and special termination benefits						11.2						—						14.3						—						—						—
Net periodic benefit costs before regulatory adjustment and intercompany allocations						129.5						56.5						107.0						3.3						(0.2)						2.7
Regulatory adjustment						29.6						5.9						(11.6)						(4.0)						(3.0)						(0.2)
Intercompany allocations						n/a						(0.2)						(22.6)						n/a						0.1						(0.3)
Net periodic benefit costs (income)						159.1						62.2						72.8						(0.7)						(3.1)						2.2
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Current year net loss						169.7						80.4						89.3						8.2						3.9						4.3
Amortization of gain (loss)						(59.2)						(33.8)						(60.0)						(0.2)						—						0.6
Prior service cost						4.1						8.1						(3.9)						0.9						0.5						0.4
Amortization of prior service cost						(1.8)						(1.6)						(0.8)						(0.5)						(0.5)						—
Total recognized in OCI or regulatory asset/liability						112.8						53.1						24.6						8.4						3.9						5.3
Total recognized in net periodic benefit costs and OCI or regulatory asset/liability						$	271.9					$	115.3					$	97.4					$	7.7					$	0.8					$	7.5

						Pension Benefits																		Post-Retirement Benefits
Year Ended December 31, 2019						Evergy						Evergy Kansas Central						Evergy Metro						Evergy						Evergy Kansas Central						Evergy Metro
Components of net periodic benefit costs						(millions)
Service cost						$	79.1					$	29.0					$	50.1					$	2.5					$	1.1					$	1.4
Interest cost						108.0						53.7						53.3						10.5						5.6						4.9
Expected return on plan assets						(106.3)						(54.8)						(48.9)						(10.0)						(6.7)						(3.3)
Prior service cost						1.9						1.7						0.9						0.5						0.5						—
Recognized net actuarial (gain) loss						33.0						25.5						49.8						(1.2)						(0.6)						(1.4)
Settlement and special termination benefits						15.6						—						23.0						—						—						—
Net periodic benefit costs before regulatory adjustment and intercompany allocations						131.3						55.1						128.2						2.3						(0.1)						1.6
Regulatory adjustment						37.4						3.0						(19.2)						(3.4)						(3.0)						0.4
Intercompany allocations						n/a						—						(34.4)						n/a						—						(0.4)
Net periodic benefit costs (income)						168.7						58.1						74.6						(1.1)						(3.1)						1.6
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Current year net (gain) loss						84.7						44.6						35.9						0.9						(3.8)						4.7
Amortization of gain (loss)						(48.6)						(25.5)						(72.8)						1.2						0.6						1.4
Amortization of prior service cost						(1.9)						(1.7)						(0.9)						(0.5)						(0.5)						—
Total recognized in OCI or regulatory asset/liability						34.2						17.4						(37.8)						1.6						(3.7)						6.1
Total recognized in net periodic benefit costs and OCI or regulatory asset/liability						$	202.9					$	75.5					$	36.8					$	0.5					$	(6.8)					$	7.7

						Pension Benefits																		Post-Retirement Benefits
Year Ended December 31, 2018						Evergy						Evergy Kansas Central						Evergy Metro						Evergy						Evergy Kansas Central						Evergy Metro
Components of net periodic benefit costs						(millions)
Service cost						$	60.7					$	32.2					$	48.6					$	2.3					$	1.3					$	2.0
Interest cost						82.5						50.7						49.9						8.0						5.0						4.8
Expected return on plan assets						(86.4)						(55.9)						(55.5)						(8.8)						(7.0)						(2.8)
Prior service cost						0.7						0.7						0.7						0.5						0.5						0.1
Recognized net actuarial (gain) loss						32.6						32.6						45.1						(0.6)						(0.6)						(0.2)
Net periodic benefit costs before regulatory adjustment and intercompany allocations						90.1						60.3						88.8						1.4						(0.8)						3.9
Regulatory adjustment						8.3						8.8						0.7						(1.7)						(2.0)						(0.1)
Intercompany allocations						n/a						—						(21.6)						n/a						—						(1.1)
Net periodic benefit costs (income)						98.4						69.1						67.9						(0.3)						(2.8)						2.7
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Current year net (gain) loss						67.2						(13.2)						25.9						4.9						11.7						(14.0)
Amortization of gain (loss)						(32.6)						(32.6)						(45.1)						0.6						0.6						0.2
Prior service cost						13.4						11.4						2.0						—						—						—
Amortization of prior service cost						(0.7)						(0.7)						(0.7)						(0.5)						(0.5)						(0.1)
Total recognized in OCI or regulatory asset/liability						47.3						(35.1)						(17.9)						5.0						11.8						(13.9)
Total recognized in net periodic benefit costs and OCI or regulatory asset/liability						$	145.7					$	34.0					$	50.0					$	4.7					$	9.0					$	(11.2)

Schedule of Defined Benefit Plan, Plan with Projected Benefit Obligation in Excess of Plan Assets

Pension and other post-retirement benefit plans with the PBO, accumulated benefit obligation (ABO) or accumulated other post-retirement benefit obligation (APBO) in excess of the fair value of plan assets at year-end are detailed in the following tables.

December 31, 2020						Evergy						Evergy Kansas Central						Evergy Metro
						(millions)
ABO for all defined benefit pension plans						$	2,534.1					$	1,281.6					$	1,227.4
Pension plans with the PBO in excess of plan assets
Projected benefit obligation						$	2,901.1					$	1,429.6					$	1,446.5
Fair value of plan assets						1,799.1						887.0						912.1
Pension plans with the ABO in excess of plan assets
Accumulated benefit obligation						$	2,534.1					$	1,281.6					$	1,227.4
Fair value of plan assets						1,799.1						887.0						912.1
Other post-retirement benefit plans with the APBO in excess of plan assets
Accumulated other post-retirement benefit obligation						$	280.4					$	146.8					$	133.6
Fair value of plan assets						248.3						125.8						122.5

December 31, 2019						Evergy						Evergy Kansas Central						Evergy Metro
						(millions)
ABO for all defined benefit pension plans						$	2,390.5					$	1,196.8					$	1,170.2
Pension plans with the PBO in excess of plan assets
Projected benefit obligation						$	2,718.2					$	1,323.4					$	1,371.4
Fair value of plan assets						1,732.8						842.1						890.7
Pension plans with the ABO in excess of plan assets
Accumulated benefit obligation						$	2,390.5					$	1,196.8					$	1,170.2
Fair value of plan assets						1,732.8						842.1						890.7
Other post-retirement benefit plans with the APBO in excess of plan assets
Accumulated other post-retirement benefit obligation						$	264.3					$	138.7					$	125.6
Fair value of plan assets						239.9						120.5						119.4

Schedule of Defined Benefit Plan, Assumptions

The following tables provide the weighted-average assumptions used to determine benefit obligations and net costs for the Evergy Companies' pension and post-retirement benefit plans.

Weighted-average assumptions used to determine the benefit obligation at December 31, 2020						Pension Benefits																		Post-Retirement Benefits
						Evergy						Evergy Kansas Central						Evergy Metro						Evergy						Evergy Kansas Central						Evergy Metro
Discount rate						2.95		%				2.93		%				2.97		%				2.84		%				2.80		%				2.88		%
Rate of compensation increase						3.71		%				3.76		%				3.71		%				3.75		%				n/a						3.75		%
Interest crediting rate for cash balance plans						4.12		%				4.00		%				4.46		%				n/a						n/a						n/a
Weighted-average assumptions used to determine the benefit obligation at December 31, 2019						Pension Benefits																		Post-Retirement Benefits
						Evergy						Evergy Kansas Central						Evergy Metro						Evergy						Evergy Kansas Central						Evergy Metro
Discount rate						3.62		%				3.61		%				3.64		%				3.56		%				3.54		%				3.58		%
Rate of compensation increase						3.74		%				3.78		%				3.71		%				3.75		%				n/a						3.75		%
Interest crediting rate for cash balance plans						4.32		%				4.21		%				4.50		%				n/a						n/a						n/a

Weighted-average assumptions used to determine net costs for the year ended December 31, 2020						Pension Benefits																		Post-Retirement Benefits
						Evergy						Evergy Kansas Central						Evergy Metro						Evergy						Evergy Kansas Central						Evergy Metro
Discount rate						3.62		%				3.61		%				3.64		%				3.56		%				3.54		%				3.58		%
Expected long-term return on plan assets						6.63		%				6.70		%				6.56		%				4.19		%				6.00		%				2.37		%
Rate of compensation increase						3.74		%				3.75		%				3.71		%				3.75		%				n/a						3.75		%
Interest crediting rate for cash balance plans						4.32		%				4.21		%				4.50		%				n/a						n/a						n/a
Weighted-average assumptions used to determine net costs for the year ended December 31, 2019						Pension Benefits																		Post-Retirement Benefits
						Evergy						Evergy Kansas Central						Evergy Metro						Evergy						Evergy Kansas Central						Evergy Metro
Discount rate						4.35		%				4.35		%				4.36		%				4.33		%				4.33		%				4.33		%
Expected long-term return on plan assets						6.61		%				6.75		%				6.47		%				4.44		%				6.00		%				2.94		%
Rate of compensation increase						3.76		%				4.03		%				3.64		%				3.50		%				n/a						3.50		%
Interest crediting rate for cash balance plans						4.32		%				4.21		%				4.50		%				n/a						n/a						n/a

Schedule of Expected Benefit Payments

The following benefit payments, which reflect expected future service, as appropriate, are expected to be paid through 2030.

			Pension Benefits																		Post-Retirement Benefits
			Evergy						Evergy Kansas Central						Evergy Metro						Evergy						Evergy Kansas Central						Evergy Metro
			(millions)
2021			$	187.6					$	96.2					$	90.2					$	16.7					$	9.5					$	7.2
2022			189.6						95.5						92.8						16.4						9.3						7.1
2023			192.6						95.7						95.6						16.1						9.1						6.9
2024			193.2						95.2						96.7						15.7						8.8						6.9
2025			195.5						94.5						99.4						15.3						8.6						6.8
2026-2030			957.0						442.8						506.5						73.1						39.8						33.3

Schedule of Allocation of Plan Assets

The following table provides the target asset allocations by asset class for the Evergy Kansas Central and Evergy Metro pension and other post-retirement plan assets. [to be updated]

			Pension Benefits												Post-Retirement Benefits
			Evergy Kansas Central						Evergy Metro						Evergy Kansas Central						Evergy Metro
Domestic equities			29%						30%						33%						3%
International equities			20%						24%						22%						—%
Bonds			36%						33%						45%						85%
Mortgage & asset backed securities			—%						—%						—%						4%
Real estate investments			4%						5%						—%						—%
Other investments			11%						9%						—%						7%

The fair values of the Evergy Companies' pension plan assets at December 31, 2020 and 2019, by asset category are in the following tables.

												Fair Value Measurements Using
Description			December 31 2020									Level 1												Level 2												Level 3												Assets measured at NAV
						(millions)
Evergy Kansas Central Pension Plans
Domestic equities						$	248.5								$	151.3											$	—											$	—											$	97.2
International equities						171.2									103.8												—												—												67.4
Bond funds						281.2									230.7												—												—												50.5
Real estate investments						46.7									—												—												—												46.7
Combination debt/equity/other fund						30.4									30.4												—												—												—
Alternative investment funds						83.6									—												—												—												83.6
Short-term investments						25.4									—												—												—												25.4
Total						$	887.0								$	516.2											$	—											$	—											$	370.8
Evergy Metro Pension Plans
Domestic equities						$	247.4								$	191.9											$	—											$	—											$	55.5
International equities						220.8									153.4												—												—												67.4
Bond funds						78.1									21.1												—												—												57.0
Corporate bonds						133.6									—												133.6												—												—
U.S. Treasury and agency bonds						73.8									61.5												12.3												—												—
Mortgage and asset backed securities						5.0									—												5.0												—												—
Real estate investments						40.2									1.6												—												—												38.6
Combination debt/equity/other fund						15.6									15.6												—												—												—
Alternative investment funds						39.7									—												—												—												39.7
Cash and cash equivalents						57.3									57.3												—												—												—
Short-term investments						1.4									—												—												—												1.4
Other						(0.8)									—												(0.8)												—												—
Total						$	912.1								$	502.4											$	150.1											$	—											$	259.6

												Fair Value Measurements Using
Description			December 31 2019									Level 1												Level 2												Level 3												Assets measured at NAV
						(millions)
Evergy Kansas Central Pension Plans
Domestic equities						$	233.8								$	150.6											$	—											$	—											$	83.2
International equities						162.4									101.5												—												—												60.9
Bond funds						281.7									233.0												—												—												48.7
Real estate investments						46.5									—												—												—												46.5
Combination debt/equity/other fund						30.1									30.1												—												—												—
Alternative investment funds						78.5									—												—												—												78.5
Short-term investments						9.1									—												—												—												9.1
Total						$	842.1								$	515.2											$	—											$	—											$	326.9
Evergy Metro Pension Plans
Domestic equities						$	244.8								$	195.3											$	—											$	—											$	49.5
International equities						178.7									117.7												—												—												61.0
Bond funds						71.0									15.6												—												—												55.4
Corporate bonds						123.9									—												123.9												—												—
U.S. Treasury and agency bonds						70.9									53.5												17.4												—												—
Mortgage and asset backed securities						5.7									—												5.7												—												—
Real estate investments						50.8									12.8												—												—												38.0
Combination debt/equity/other fund						11.9									11.9												—												—												—
Alternative investment funds						36.6									—												—												—												36.6
Cash and cash equivalents						92.9									92.9												—												—												—
Short-term investments						1.0									—												—												—												1.0
Other						2.5									—												2.5												—												—
Total						$	890.7								$	499.7											$	149.5											$	—											$	241.5

The fair values of the Evergy Companies' post-retirement plan assets at December 31, 2020 and 2019, by asset category are in the following tables.

												Fair Value Measurements Using
Description			December 31 2020									Level 1												Level 2												Level 3												Assets measured at NAV
						(millions)
Evergy Kansas Central Post-Retirement Benefit Plans
Domestic equities						$	41.9								$	—											$	—											$	—											$	41.9
International equities						27.7									—												—												—												27.7
Bond funds						55.5									—												—												—												55.5
Cash and cash equivalents						0.7									0.7												—												—												—
Total						$	125.8								$	0.7											$	—											$	—											$	125.1
Evergy Metro Post-Retirement Benefit Plans
Domestic equities						$	4.6								$	4.6											$	—											$	—											$	—
International equities						1.2									1.2												—												—												—
Bond funds						79.0									0.2												—												—												78.8
Corporate bonds						17.9									—												17.9												—												—
U.S. Treasury and agency bonds						13.6									5.7												7.9												—												—
Mortgage and asset backed securities						0.5									—												0.5												—												—
Cash and cash equivalents						5.4									5.4												—												—												—
Other						0.3									—												0.3												—												—
Total						$	122.5								$	17.1											$	26.6											$	—											$	78.8

												Fair Value Measurements Using
Description			December 31 2019									Level 1												Level 2												Level 3												Assets measured at NAV
						(millions)
Evergy Kansas Central Post-Retirement Benefit Plans
Domestic equities						$	40.5								$	—											$	—											$	—											$	40.5
International equities						26.0									—												—												—												26.0
Bond funds						52.9									—												—												—												52.9
Cash and cash equivalents						1.1									1.1												—												—												—
Total						$	120.5								$	1.1											$	—											$	—											$	119.4
Evergy Metro Post-Retirement Benefit Plans
Domestic equities						$	3.2								$	3.2											$	—											$	—											$	—
International equities						1.1									1.1												—												—												—
Bond funds						77.5									0.1												—												—												77.4
Corporate bonds						17.8									—												17.8												—												—
U.S. Treasury and agency bonds						11.5									4.1												7.4												—												—
Mortgage and asset backed securities						1.3									—												1.3												—												—
Cash and cash equivalents						6.7									6.7												—												—												—
Other						0.3									—												0.3												—												—
Total						$	119.4								$	15.2											$	26.8											$	—											$	77.4

Schedule of Health Care Cost Trend Rates

The cost trend assumptions are detailed in the following tables.

Assumed annual health care cost growth rates as of December 31, 2020						Evergy						Evergy Kansas Central						Evergy Metro
Health care cost trend rate assumed for next year						6.0		%				6.0		%				6.0		%
Rate to which the cost trend is assumed to decline (the ultimate trend rate)						4.5		%				4.5		%				4.5		%
Year that rate reaches ultimate trend						2027						2027						2027
Assumed annual health care cost growth rates as of December 31, 2019						Evergy						Evergy Kansas Central						Evergy Metro
Health care cost trend rate assumed for next year						6.3		%				6.3		%				6.3		%
Rate to which the cost trend is assumed to decline (the ultimate trend rate)						4.5		%				4.5		%				4.5		%
Year that rate reaches ultimate trend						2027						2027						2027

Schedule of Costs of Retirement Plans

Evergy has defined contribution savings plans (401(k)) that cover substantially all employees. Evergy matches employee contributions, subject to limits. The annual costs of the plans are detailed in the following table. Evergy Metro amounts are only included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

						2020						2019						2018
						(millions)
Evergy						$	17.4					$	17.6					$	16.3
Evergy Kansas Central						9.6						9.6						9.9
Evergy Metro						7.8						8.0						8.3

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