Comprehensive Income (Tables)

3 Months Ended

Mar. 31, 2024

Changes in Accumulated Other Comprehensive Income (Loss) by Component

	Cash Flow Hedges				Pension
Three Months Ended March 31, 2024	Commodity		Interest Rate		and OPEB		Total
	(in millions)
Balance in AOCI as of December 31, 2023	$	104.9	$	(8.1)	$	(152.3)	$	(55.5)
Change in Fair Value Recognized in AOCI, Net of Tax	5.5		12.4		—		17.9
Amount of (Gain) Loss Reclassified from AOCI
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation (a)	(29.3)		—		—		(29.3)
Interest Expense (a)	—		(1.2)		—		(1.2)
Amortization of Prior Service Cost (Credit)	—		—		(1.3)		(1.3)
Amortization of Actuarial (Gains) Losses	—		—		0.5		0.5
Reclassifications from AOCI, before Income Tax Benefit	(29.3)		(1.2)		(0.8)		(31.3)
Income Tax Benefit	(6.1)		(0.3)		(0.2)		(6.6)
Reclassifications from AOCI, Net of Income Tax Benefit	(23.2)		(0.9)		(0.6)		(24.7)
Net Current Period Other Comprehensive Income (Loss)	(17.7)		11.5		(0.6)		(6.8)
Balance in AOCI as of March 31, 2024	$	87.2	$	3.4	$	(152.9)	$	(62.3)

	Cash Flow Hedges				Pension
Three Months Ended March 31, 2023	Commodity		Interest Rate		and OPEB		Total
	(in millions)
Balance in AOCI as of December 31, 2022	$	223.5	$	0.3	$	(140.1)	$	83.7
Change in Fair Value Recognized in AOCI, Net of Tax	(195.3)		5.2		(12.9)		(203.0)
Amount of (Gain) Loss Reclassified from AOCI
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation (a)	47.0		—		—		47.0
Interest Expense (a)	—		0.7		—		0.7
Amortization of Prior Service Cost (Credit)	—		—		(5.3)		(5.3)
Amortization of Actuarial (Gains) Losses	—		—		1.2		1.2
Reclassifications from AOCI, before Income Tax (Expense) Benefit	47.0		0.7		(4.1)		43.6
Income Tax (Expense) Benefit	9.9		0.1		(0.9)		9.1
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit	37.1		0.6		(3.2)		34.5
Reclassifications of KPCo Pension and OPEB Regulatory Assets from AOCI, Before Income Tax (Expense) Benefit	—		—		21.1		21.1
Income Tax (Expense) Benefit	—		—		4.4		4.4
Reclassifications of KPCo Pension and OPEB Regulatory Assets from AOCI, Net of Income Tax (Expense) Benefit	—		—		16.7		16.7
Net Current Period Other Comprehensive Income (Loss)	(158.2)		5.8		0.6		(151.8)
Balance in AOCI as of March 31, 2023	$	65.3	$	6.1	$	(139.5)	$	(68.1)

(a)Amounts reclassified to the referenced line item on the statements of income.