ASSET RETIREMENT OBLIGATIONS (Tables)

9 Months Ended

Sep. 30, 2021

Asset Retirement Obligation Disclosure [Abstract]

Schedule of changes to our asset retirement obligations

The following table shows changes to our AROs during the nine months ended September 30, 2021:

(in millions)	Nine Months Ended September 30, 2021
Balance as of January 1, 2021	$	54.5
Accretion	1.2
Revisions to estimated cash flows	16.7		(1)
Liabilities settled	(1.1)
Balance as of September 30, 2021	$	71.3

(1)    This increase was primarily due to revisions made to estimated cash flows for the legal requirement to dismantle, at retirement, our wind generation projects.