REGULATORY ASSETS AND LIABILITIES (Tables)

6 Months Ended

Jun. 30, 2021

Regulatory Assets and Liabilities Disclosure [Abstract]

Schedule of regulatory assets

(in millions)	June 30, 2021		December 31, 2020
Regulatory assets
Pension and OPEB costs	$	1,054.4	$	1,101.6
Plant retirements	729.1		740.8
Environmental remediation costs	609.3		638.2
Income tax related items	459.1		454.6
Energy costs recoverable through rate adjustments (1)	203.3		1.1
Asset retirement obligations	190.7		181.3
SSR	132.8		135.6
Securitization (2)	106.0		105.2
Uncollectible expense	41.2		82.0
Derivatives	7.1		26.5
Other, net	90.5		77.2
Total regulatory assets	$	3,623.5	$	3,544.1
Balance sheet presentation
Amounts recoverable from customers (1)	$	213.6	$	20.0
Regulatory assets	3,409.9		3,524.1
Total regulatory assets	$	3,623.5	$	3,544.1

(1)The increase in these regulatory assets primarily relates to the high natural gas costs that were incurred as a result of the extreme winter weather conditions in February 2021. See Note 22, Regulatory Environment, for more information.

(2)See Note 19, Variable Interest Entities, for more information.

Schedule of regulatory liabilities

(in millions)	June 30, 2021		December 31, 2020
Regulatory liabilities
Income tax related items	$	2,071.6	$	2,137.7
Removal costs	1,243.6		1,221.1
Pension and OPEB benefits	367.7		378.1
Derivatives	95.6		16.4
Electric transmission costs	78.4		78.5
Energy costs refundable through rate adjustments	35.6		59.9
Earnings sharing mechanisms	28.3		36.9
Uncollectible expense	12.2		25.5
Other, net	25.8		25.0
Total regulatory liabilities	$	3,958.8	$	3,979.1
Balance sheet presentation
Other current liabilities	$	23.3	$	51.0
Regulatory liabilities	3,935.5		3,928.1
Total regulatory liabilities	$	3,958.8	$	3,979.1