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DEFERRED CHARGES AND OTHER ASSETS, NET (Tables)
 12 Months Ended
Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Schedule of deferred charges and other assets, net
Deferred charges and other assets, net consisted of the following:  
(in millions)December 31, 2020December 31, 2019
Deferred turnaround costs, net$598.2 $722.7 
Catalyst, net155.2 132.7 
Environmental credits39.6 37.8 
Linefill27.4 19.5 
Pension plan assets21.2 10.3 
Intangible assets, net0.5 0.5 
Other20.6 6.5 
Total deferred charges and other assets, net$862.7 $930.0 
Intangible assets, net
Intangible assets, net primarily consists of permits and emission credits. Our net balance as of December 31, 2020 and December 31, 2019 is shown below:
(in millions)December 31, 2020December 31, 2019
Intangible assets - gross$4.0 $4.0 
Accumulated amortization(3.5)(3.5)
Intangible assets - net $0.5 $0.5