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ORGANIZATION AND BASIS OF PRESENTATION - Summary of Reclassifications (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Adjustments to reconcile income to net cash from operating activities:    
Amortization of deferred refueling outage $ 6.5 $ 4.0
Deferred income taxes, net (1.0) 9.6
Investment tax credit amortization (1.0) (0.6)
Net deferred income taxes and credits (2.0) 3.8
Other (1.3) (1.4)
Changes in working capital items:    
Fuel inventory and supplies 44.6 6.9
Prepaid expenses and other current assets 35.5 (0.1)
Other current liabilities (74.7) (11.8)
Changes in other assets 12.8 0.7
Changes in other liabilities (2.8) 23.7
Cash Flows from Operating Activities 362.1 259.6
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:    
Additions to property, plant and equipment (309.0) (174.8)
Other investing activities 1.3 (1.6)
Cash Flows used in Investing Activities (271.4) (174.1)
KCP&L    
Adjustments to reconcile income to net cash from operating activities:    
Amortization of deferred refueling outage 3.2 3.9
Deferred income taxes, net (4.8) 5.6
Investment tax credit amortization (0.2) (0.3)
Net deferred income taxes and credits (5.0) 5.3
Other 0.6 0.2
Changes in working capital items:    
Fuel inventory and supplies 18.3 (2.8)
Prepaid expenses and other current assets 19.2 (2.5)
Other current liabilities (31.9) (1.8)
Changes in other assets 8.9 16.5
Changes in other liabilities 9.2 13.5
Cash Flows from Operating Activities 142.3 105.0
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:    
Additions to property, plant and equipment (114.7) (100.6)
Other investing activities 1.9 0.6
Cash Flows used in Investing Activities $ (114.9) (100.8)
KCP&L | As Previously Filed    
Adjustments to reconcile income to net cash from operating activities:    
Amortization of other   6.6
Amortization of deferred refueling outage   0.0
Deferred income taxes, net   5.6
Investment tax credit amortization   (0.3)
Net deferred income taxes and credits   0.0
Other   3.8
Changes in working capital items:    
Fuel inventory and supplies   0.0
Fuel inventories   (1.0)
Materials and supplies   (1.8)
Prepaid expenses and other current assets   0.0
Accrued interest   8.3
Other current liabilities   0.0
Changes in other assets   0.0
Changes in other liabilities   0.0
Deferred refueling outage costs   0.9
Pension and post-retirement benefit obligations   9.0
Fuel recovery mechanisms   1.2
Cash Flows from Operating Activities   32.3
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:    
Additions to property, plant and equipment   0.0
Utility capital expenditures   (93.5)
Allowance for borrowed funds used during construction   (2.0)
Other investing activities   (4.5)
Cash Flows used in Investing Activities   (100.0)
KCP&L | As Recast    
Adjustments to reconcile income to net cash from operating activities:    
Amortization of other   0.0
Amortization of deferred refueling outage   3.9
Deferred income taxes, net   0.0
Investment tax credit amortization   0.0
Net deferred income taxes and credits   5.3
Other   0.2
Changes in working capital items:    
Fuel inventory and supplies   (2.8)
Fuel inventories   0.0
Materials and supplies   0.0
Prepaid expenses and other current assets   (2.5)
Accrued interest   0.0
Other current liabilities   (1.8)
Changes in other assets   16.5
Changes in other liabilities   13.5
Deferred refueling outage costs   0.0
Pension and post-retirement benefit obligations   0.0
Fuel recovery mechanisms   0.0
Cash Flows from Operating Activities   32.3
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:    
Additions to property, plant and equipment   (100.6)
Utility capital expenditures   0.0
Allowance for borrowed funds used during construction   0.0
Other investing activities   0.6
Cash Flows used in Investing Activities   $ (100.0)