The following tables provide the components of changes in AOCI and details of reclassifications from AOCI. The amortization of pension and OPEB AOCI components are included in the computation of net periodic pension and OPEB costs. See Note 7 - Benefit Plans for additional details.


	Cash Flow Hedges							Pension
Three Months Ended June 30, 2020	Commodity		Interest Rate			and OPEB		Total
	(in millions)
Balance in AOCI as of March 31, 2020	$	(128.5)	$	(53.5)		$	(34.5)	$	(216.5)
Change in Fair Value Recognized in AOCI	6.5		(2.8)		(a)	—		3.7
Amount of (Gain) Loss Reclassified from AOCI
Generation & Marketing Revenues (b)	(0.1)		—			—		(0.1)
Purchased Electricity for Resale (b)	51.3		—			—		51.3
Interest Expense (b)	—		1.4			—		1.4
Amortization of Prior Service Cost (Credit)	—		—			(4.6)		(4.6)
Amortization of Actuarial (Gains) Losses	—		—			2.5		2.5
Reclassifications from AOCI, before Income Tax (Expense) Benefit	51.2		1.4			(2.1)		50.5
Income Tax (Expense) Benefit	10.6		0.4			(0.4)		10.6
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit	40.6		1.0			(1.7)		39.9
Net Current Period Other Comprehensive Income (Loss)	47.1		(1.8)			(1.7)		43.6
Balance in AOCI as of June 30, 2020	$	(81.4)	$	(55.3)		$	(36.2)	$	(172.9)


	Cash Flow Hedges							Pension
Three Months Ended June 30, 2019	Commodity		Interest Rate			and OPEB		Total
	(in millions)
Balance in AOCI as of March 31, 2019	$	(52.1)	$	(12.4)		$	(86.2)	$	(150.7)
Change in Fair Value Recognized in AOCI	(91.9)		(3.7)		(c)	—		(95.6)
Amount of (Gain) Loss Reclassified from AOCI

Purchased Electricity for Resale (b)	21.2		—			—		21.2
Interest Expense (b)	—		0.3			—		0.3
Amortization of Prior Service Cost (Credit)	—		—			(4.7)		(4.7)
Amortization of Actuarial (Gains) Losses	—		—			3.0		3.0
Reclassifications from AOCI, before Income Tax (Expense) Benefit	21.2		0.3			(1.7)		19.8
Income Tax (Expense) Benefit	4.4		0.1			(0.3)		4.2
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit	16.8		0.2			(1.4)		15.6
Net Current Period Other Comprehensive Income (Loss)	(75.1)		(3.5)			(1.4)		(80.0)
Balance in AOCI as of June 30, 2019	$	(127.2)	$	(15.9)		$	(87.6)	$	(230.7)


	Cash Flow Hedges							Pension
Six Months Ended June 30, 2020	Commodity		Interest Rate			and OPEB		Total
	(in millions)
Balance in AOCI as of December 31, 2019	$	(103.5)	$	(11.5)		$	(32.7)	$	(147.7)
Change in Fair Value Recognized in AOCI	(58.8)		(45.5)		(a)	—		(104.3)
Amount of (Gain) Loss Reclassified from AOCI
Generation & Marketing Revenues (b)	(0.2)		—			—		(0.2)
Purchased Electricity for Resale (b)	102.4		—			—		102.4
Interest Expense (b)	—		2.3			—		2.3
Amortization of Prior Service Cost (Credit)	—		—			(9.5)		(9.5)
Amortization of Actuarial (Gains) Losses	—		—			5.1		5.1
Reclassifications from AOCI, before Income Tax (Expense) Benefit	102.2		2.3			(4.4)		100.1
Income Tax (Expense) Benefit	21.3		0.6			(0.9)		21.0
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit	80.9		1.7			(3.5)		79.1
Net Current Period Other Comprehensive Income (Loss)	22.1		(43.8)			(3.5)		(25.2)
Balance in AOCI as of June 30, 2020	$	(81.4)	$	(55.3)		$	(36.2)	$	(172.9)


	Cash Flow Hedges							Pension
Six Months Ended June 30, 2019	Commodity		Interest Rate			and OPEB		Total
	(in millions)
Balance in AOCI as of December 31, 2018	$	(23.0)	$	(12.6)		$	(84.8)	$	(120.4)
Change in Fair Value Recognized in AOCI	(130.7)		(3.7)		(c)	—		(134.4)
Amount of (Gain) Loss Reclassified from AOCI

Purchased Electricity for Resale (b)	33.5		—			—		33.5
Interest Expense (b)	—		0.5			—		0.5
Amortization of Prior Service Cost (Credit)	—		—			(9.5)		(9.5)
Amortization of Actuarial (Gains) Losses	—		—			6.0		6.0
Reclassifications from AOCI, before Income Tax (Expense) Benefit	33.5		0.5			(3.5)		30.5
Income Tax (Expense) Benefit	7.0		0.1			(0.7)		6.4
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit	26.5		0.4			(2.8)		24.1
Net Current Period Other Comprehensive Income (Loss)	(104.2)		(3.3)			(2.8)		(110.3)
Balance in AOCI as of June 30, 2019	$	(127.2)	$	(15.9)		$	(87.6)	$	(230.7)


		Cash Flow Hedge –		Pension
Three Months Ended June 30, 2020		Interest Rate		and OPEB		Total
	(in millions)
Balance in AOCI as of March 31, 2020		$	(3.1)	$	(9.4)	$	(12.5)
Change in Fair Value Recognized in AOCI		—		—		—
Amount of (Gain) Loss Reclassified from AOCI


Interest Expense (b)		0.2		—		0.2

Amortization of Actuarial (Gains) Losses		—		0.1		0.1
Reclassifications from AOCI, before Income Tax (Expense) Benefit		0.2		0.1		0.3
Income Tax (Expense) Benefit		—		—		—
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit		0.2		0.1		0.3
Net Current Period Other Comprehensive Income (Loss)		0.2		0.1		0.3
Balance in AOCI as of June 30, 2020		$	(2.9)	$	(9.3)	$	(12.2)


		Cash Flow Hedge –		Pension
Three Months Ended June 30, 2019		Interest Rate		and OPEB		Total
	(in millions)
Balance in AOCI as of March 31, 2019		$	(4.1)	$	(10.7)	$	(14.8)
Change in Fair Value Recognized in AOCI		—		—		—
Amount of (Gain) Loss Reclassified from AOCI


Interest Expense (b)		0.2		—		0.2

Amortization of Actuarial (Gains) Losses		—		0.1		0.1
Reclassifications from AOCI, before Income Tax (Expense) Benefit		0.2		0.1		0.3
Income Tax (Expense) Benefit		—		—		—
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit		0.2		0.1		0.3
Net Current Period Other Comprehensive Income (Loss)		0.2		0.1		0.3
Balance in AOCI as of June 30, 2019		$	(3.9)	$	(10.6)	$	(14.5)


		Cash Flow Hedge –		Pension
Six Months Ended June 30, 2020		Interest Rate		and OPEB		Total
	(in millions)
Balance in AOCI as of December 31, 2019		$	(3.4)	$	(9.4)	$	(12.8)
Change in Fair Value Recognized in AOCI		—		—		—
Amount of (Gain) Loss Reclassified from AOCI


Interest Expense (b)		0.6		—		0.6

Amortization of Actuarial (Gains) Losses		—		0.1		0.1
Reclassifications from AOCI, before Income Tax (Expense) Benefit		0.6		0.1		0.7
Income Tax (Expense) Benefit		0.1		—		0.1
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit		0.5		0.1		0.6
Net Current Period Other Comprehensive Income (Loss)		0.5		0.1		0.6
Balance in AOCI as of June 30, 2020		$	(2.9)	$	(9.3)	$	(12.2)


		Cash Flow Hedge –		Pension
Six Months Ended June 30, 2019		Interest Rate		and OPEB		Total
	(in millions)
Balance in AOCI as of December 31, 2018		$	(4.4)	$	(10.7)	$	(15.1)
Change in Fair Value Recognized in AOCI		—		—		—
Amount of (Gain) Loss Reclassified from AOCI


Interest Expense (b)		0.6		—		0.6

Amortization of Actuarial (Gains) Losses		—		0.1		0.1
Reclassifications from AOCI, before Income Tax (Expense) Benefit		0.6		0.1		0.7
Income Tax (Expense) Benefit		0.1		—		0.1
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit		0.5		0.1		0.6
Net Current Period Other Comprehensive Income (Loss)		0.5		0.1		0.6
Balance in AOCI as of June 30, 2019		$	(3.9)	$	(10.6)	$	(14.5)


		Cash Flow Hedge –		Pension
Three Months Ended June 30, 2020		Interest Rate		and OPEB		Total
	(in millions)
Balance in AOCI as of March 31, 2020		$	(3.3)	$	3.2	$	(0.1)
Change in Fair Value Recognized in AOCI		(0.6)		—		(0.6)
Amount of (Gain) Loss Reclassified from AOCI


Interest Expense (b)		(0.2)		—		(0.2)
Amortization of Prior Service Cost (Credit)		—		(1.4)		(1.4)
Amortization of Actuarial (Gains) Losses		—		0.2		0.2
Reclassifications from AOCI, before Income Tax (Expense) Benefit		(0.2)		(1.2)		(1.4)
Income Tax (Expense) Benefit		—		(0.2)		(0.2)
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit		(0.2)		(1.0)		(1.2)
Net Current Period Other Comprehensive Income (Loss)		(0.8)		(1.0)		(1.8)
Balance in AOCI as of June 30, 2020		$	(4.1)	$	2.2	$	(1.9)


		Cash Flow Hedge –		Pension
Three Months Ended June 30, 2019		Interest Rate		and OPEB		Total
	(in millions)
Balance in AOCI as of March 31, 2019		$	1.6	$	(7.4)	$	(5.8)
Change in Fair Value Recognized in AOCI		—		—		—
Amount of (Gain) Loss Reclassified from AOCI


Interest Expense (b)		(0.2)		—		(0.2)
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 (Expense) Benefit		(0.2)		(0.8)		(1.0)
Income Tax (Expense) Benefit		—		(0.1)		(0.1)
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit		(0.2)		(0.7)		(0.9)
Net Current Period Other Comprehensive Income (Loss)		(0.2)		(0.7)		(0.9)
Balance in AOCI as of June 30, 2019		$	1.4	$	(8.1)	$	(6.7)


		Cash Flow Hedge –		Pension
Six Months Ended June 30, 2020		Interest Rate		and OPEB		Total
	(in millions)
Balance in AOCI as of December 31, 2019		$	0.9	$	4.1	$	5.0
Change in Fair Value Recognized in AOCI		(4.5)		—		(4.5)
Amount of (Gain) Loss Reclassified from AOCI


Interest Expense (b)		(0.6)		—		(0.6)
Amortization of Prior Service Cost (Credit)		—		(2.7)		(2.7)
Amortization of Actuarial (Gains) Losses		—		0.3		0.3
Reclassifications from AOCI, before Income Tax (Expense) Benefit		(0.6)		(2.4)		(3.0)
Income Tax (Expense) Benefit		(0.1)		(0.5)		(0.6)
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit		(0.5)		(1.9)		(2.4)
Net Current Period Other Comprehensive Income (Loss)		(5.0)		(1.9)		(6.9)
Balance in AOCI as of June 30, 2020		$	(4.1)	$	2.2	$	(1.9)


		Cash Flow Hedge –		Pension
Six Months Ended June 30, 2019		Interest Rate		and OPEB		Total
	(in millions)
Balance in AOCI as of December 31, 2018		$	1.8	$	(6.8)	$	(5.0)
Change in Fair Value Recognized in AOCI		—		—		—
Amount of (Gain) Loss Reclassified from AOCI


Interest Expense (b)		(0.5)		—		(0.5)
Amortization of Prior Service Cost (Credit)		—		(2.6)		(2.6)
Amortization of Actuarial (Gains) Losses		—		1.0		1.0
Reclassifications from AOCI, before Income Tax (Expense) Benefit		(0.5)		(1.6)		(2.1)
Income Tax (Expense) Benefit		(0.1)		(0.3)		(0.4)
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit		(0.4)		(1.3)		(1.7)
Net Current Period Other Comprehensive Income (Loss)		(0.4)		(1.3)		(1.7)
Balance in AOCI as of June 30, 2019		$	1.4	$	(8.1)	$	(6.7)


		Cash Flow Hedge –		Pension
Three Months Ended June 30, 2020		Interest Rate		and OPEB		Total
	(in millions)
Balance in AOCI as of March 31, 2020		$	(9.5)	$	(1.7)	$	(11.2)
Change in Fair Value Recognized in AOCI		—		—		—
Amount of (Gain) Loss Reclassified from AOCI


Interest Expense (b)		0.5		—		0.5
Amortization of Prior Service Cost (Credit)		—		(0.1)		(0.1)
Amortization of Actuarial (Gains) Losses		—		0.1		0.1
Reclassifications from AOCI, before Income Tax (Expense) Benefit		0.5		—		0.5
Income Tax (Expense) Benefit		0.1		—		0.1
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit		0.4		—		0.4
Net Current Period Other Comprehensive Income (Loss)		0.4		—		0.4
Balance in AOCI as of June 30, 2020		$	(9.1)	$	(1.7)	$	(10.8)


		Cash Flow Hedge –		Pension
Three Months Ended June 30, 2019		Interest Rate		and OPEB		Total
	(in millions)
Balance in AOCI as of March 31, 2019		$	(11.1)	$	(2.3)	$	(13.4)
Change in Fair Value Recognized in AOCI		—		—		—
Amount of (Gain) Loss Reclassified from AOCI


Interest Expense (b)		0.5		—		0.5
Amortization of Prior Service Cost (Credit)		—		(0.2)		(0.2)
Amortization of Actuarial (Gains) Losses		—		0.1		0.1
Reclassifications from AOCI, before Income Tax (Expense) Benefit		0.5		(0.1)		0.4
Income Tax (Expense) Benefit		0.1		—		0.1
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit		0.4		(0.1)		0.3
Net Current Period Other Comprehensive Income (Loss)		0.4		(0.1)		0.3
Balance in AOCI as of June 30, 2019		$	(10.7)	$	(2.4)	$	(13.1)


		Cash Flow Hedge –		Pension
Six Months Ended June 30, 2020		Interest Rate		and OPEB		Total
	(in millions)
Balance in AOCI as of December 31, 2019		$	(9.9)	$	(1.7)	$	(11.6)
Change in Fair Value Recognized in AOCI		—		—		—
Amount of (Gain) Loss Reclassified from AOCI


Interest Expense (b)		1.0		—		1.0
Amortization of Prior Service Cost (Credit)		—		(0.3)		(0.3)
Amortization of Actuarial (Gains) Losses		—		0.3		0.3
Reclassifications from AOCI, before Income Tax (Expense) Benefit		1.0		—		1.0
Income Tax (Expense) Benefit		0.2		—		0.2
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit		0.8		—		0.8
Net Current Period Other Comprehensive Income (Loss)		0.8		—		0.8
Balance in AOCI as of June 30, 2020		$	(9.1)	$	(1.7)	$	(10.8)


		Cash Flow Hedge –		Pension
Six Months Ended June 30, 2019		Interest Rate		and OPEB		Total
	(in millions)
Balance in AOCI as of December 31, 2018		$	(11.5)	$	(2.3)	$	(13.8)
Change in Fair Value Recognized in AOCI		—		—		—
Amount of (Gain) Loss Reclassified from AOCI


Interest Expense (b)		1.0		—		1.0
Amortization of Prior Service Cost (Credit)		—		(0.4)		(0.4)
Amortization of Actuarial (Gains) Losses		—		0.3		0.3
Reclassifications from AOCI, before Income Tax (Expense) Benefit		1.0		(0.1)		0.9
Income Tax (Expense) Benefit		0.2		—		0.2
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit		0.8		(0.1)		0.7
Net Current Period Other Comprehensive Income (Loss)		0.8		(0.1)		0.7
Balance in AOCI as of June 30, 2019		$	(10.7)	$	(2.4)	$	(13.1)

Cash Flow Hedge –

Three Months Ended June 30, 2020

Interest Rate

(in millions)

Balance in AOCI as of March 31, 2020

—

Change in Fair Value Recognized in AOCI

—

Amount of (Gain) Loss Reclassified from AOCI

Interest Expense (b)

—

Reclassifications from AOCI, before Income Tax (Expense) Benefit

—

Income Tax (Expense) Benefit

—

Reclassifications from AOCI, Net of Income Tax (Expense) Benefit

—

Net Current Period Other Comprehensive Income (Loss)

—

Balance in AOCI as of June 30, 2020

—


		Cash Flow Hedge –
Three Months Ended June 30, 2019		Interest Rate
	(in millions)
Balance in AOCI as of March 31, 2019		$	0.7
Change in Fair Value Recognized in AOCI		—
Amount of (Gain) Loss Reclassified from AOCI


Interest Expense (b)		(0.5)


Reclassifications from AOCI, before Income Tax (Expense) Benefit		(0.5)
Income Tax (Expense) Benefit		(0.1)
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit		(0.4)
Net Current Period Other Comprehensive Income (Loss)		(0.4)
Balance in AOCI as of June 30, 2019		$	0.3