REGULATORY ASSETS AND LIABILITIES (Tables)

3 Months Ended

Mar. 31, 2024

Regulatory Assets and Liabilities Disclosure [Abstract]

Schedule of regulatory assets

(in millions)	March 31, 2024		December 31, 2023
Regulatory assets
Pension and OPEB costs	$	728.9	$	731.7
Plant retirement related items	637.8		646.2
Environmental remediation costs	583.8		596.8
Income tax related items	444.5		449.9
AROs	159.8		162.0
Uncollectible expense	133.7		127.7
System support resource	110.6		113.2
Derivatives	88.7		130.3
Decoupling	87.2		27.3
Securitization	84.1		85.9
Bluewater	51.1		45.3
Energy efficiency programs	29.3		33.9
Other, net	147.4		124.5
Total regulatory assets	$	3,286.9	$	3,274.7
Balance sheet presentation
Other current assets	$	39.9	$	24.9
Regulatory assets	3,247.0		3,249.8
Total regulatory assets	$	3,286.9	$	3,274.7

Schedule of regulatory liabilities

(in millions)	March 31, 2024		December 31, 2023
Regulatory liabilities
Income tax related items	$	1,862.6	$	1,901.8
Removal costs	1,365.4		1,329.9
Pension and OPEB benefits	300.0		299.2
Energy costs refundable through rate adjustments	119.3		72.4
Electric transmission costs	31.0		30.3
Energy efficiency programs	20.6		17.2
Uncollectible expense	19.0		21.2
Derivatives	15.2		19.2
Other, net	76.3		54.0
Total regulatory liabilities	$	3,809.4	$	3,745.2
Balance sheet presentation
Other current liabilities	$	79.2	$	47.5
Regulatory liabilities	3,730.2		3,697.7
Total regulatory liabilities	$	3,809.4	$	3,745.2