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DEFERRED CHARGES AND OTHER ASSETS, NET
 12 Months Ended
Dec. 31, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
DEFERRED CHARGES AND OTHER ASSETS, NET DEFERRED CHARGES AND OTHER ASSETS, NET
Deferred charges and other assets, net consisted of the following:  
(in millions)December 31, 2021December 31, 2020
Deferred turnaround costs, net$537.0 $598.2 
Catalyst, net (a)166.8 155.2 
Environmental credits41.3 39.6 
Linefill27.4 27.4 
Pension plan assets20.7 21.2 
Intangible assets, net0.5 0.5 
Other20.1 20.6 
Total deferred charges and other assets, net$813.8 $862.7 

(a) Catalyst, net includes $113.0 million and $115.2 million of indefinite-lived precious metal catalysts (both owned or financed as part of existing catalyst financing arrangements) as of December 31, 2021 and December 31, 2020, respectively.
The Company recorded amortization expense related to deferred turnaround costs, catalyst and intangible assets of $220.6 million, $315.7 million and $256.8 million for the years ended December 31, 2021, 2020 and 2019, respectively. Included in the year 2020 amortization expense is approximately $56.2 million of accelerated unamortized deferred turnaround costs associated with assets that were idled as part of the East Coast Refining Reconfiguration.
Intangible assets, net primarily consists of permits and emission credits. Our net balance as of December 31, 2021 and December 31, 2020 is shown below:
(in millions)December 31, 2021December 31, 2020
Intangible assets - gross$4.0 $4.0 
Accumulated amortization(3.5)(3.5)
Intangible assets - net $0.5 $0.5