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REGULATORY ASSETS AND LIABILITIES
 3 Months Ended
Mar. 31, 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 March 31, 2021 and December 31, 2020. For more information on our regulatory assets and liabilities, see Note 6, Regulatory Assets and Liabilities, in our 2020 Annual Report on Form 10-K.
(in millions)March 31, 2021December 31, 2020
Regulatory assets
Pension and OPEB costs$1,073.9 $1,101.6 
Plant retirements733.1 740.8 
Environmental remediation costs623.1 638.2 
Income tax related items459.3 454.6 
Energy costs recoverable through rate adjustments (1)
301.6 1.1 
Asset retirement obligations186.0 181.3 
SSR134.6 135.6 
Securitization106.9 105.2 
Uncollectible expense73.0 82.0 
Derivatives9.6 26.5 
Other, net92.7 77.2 
Total regulatory assets$3,793.8 $3,544.1 
Balance sheet presentation
Amounts recoverable from customers (1)
$306.7 $20.0 
Regulatory assets3,487.1 3,524.1 
Total regulatory assets$3,793.8 $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.
(in millions)March 31, 2021December 31, 2020
Regulatory liabilities
Income tax related items$2,111.0 $2,137.7 
Removal costs 1,234.6 1,221.1 
Pension and OPEB benefits373.1 378.1 
Electric transmission costs75.9 78.5 
Earnings sharing mechanisms30.8 36.9 
Energy costs refundable through rate adjustments24.7 59.9 
Derivatives17.4 16.4 
Energy efficiency programs11.0 9.9 
Uncollectible expense3.2 25.5 
Other, net21.6 15.1 
Total regulatory liabilities$3,903.3 $3,979.1 
Balance sheet presentation
Other current liabilities$12.5 $51.0 
Regulatory liabilities3,890.8 3,928.1 
Total regulatory liabilities$3,903.3 $3,979.1