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REGULATORY ASSETS AND LIABILITIES
 9 Months Ended
Sep. 30, 2021
Regulatory Assets and Liabilities Disclosure [Abstract]  
REGULATORY ASSETS AND LIABILITIES REGULATORY ASSETS AND LIABILITIES
The following regulatory assets and liabilities were reflected on our balance sheets at September 30, 2021 and December 31, 2020. For more information on our regulatory assets and liabilities, see Note 5, Regulatory Assets and Liabilities, in our 2020 Annual Report on Form 10-K.
(in millions)September 30, 2021December 31, 2020
Regulatory assets
Finance leases$1,021.9 $985.5 
Plant retirements661.1 669.8 
Pension and OPEB costs446.8 477.0 
Income tax related items388.7 392.6 
SSR131.6 135.6 
Securitization (1)
102.9 105.2 
AROs43.7 28.6 
Other, net12.4 9.0 
Total regulatory assets$2,809.1 $2,803.3 

(1)See Note 17, Variable Interest Entities, for more information.
(in millions)September 30, 2021December 31, 2020
Regulatory liabilities
Income tax related items$742.7 $806.7 
Removal costs 694.0 677.2 
Pension and OPEB benefits129.4 132.1 
Derivatives (1)
106.6 5.9 
Electric transmission costs64.1 61.7 
Uncollectible expense25.8 15.5 
Other, net14.8 8.8 
Total regulatory liabilities$1,777.4 $1,707.9 
Balance sheet presentation
Other current liabilities$— $4.2 
Regulatory liabilities1,777.4 1,703.7 
Total regulatory liabilities$1,777.4 $1,707.9 
(1)    For most energy-related physical and financial contracts that qualify as derivatives, the PSCW allows the effects of fair value accounting to be offset to regulatory assets and liabilities. See Note 13, Derivative Instruments, for more information.