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DEFERRED CHARGES AND OTHER ASSETS, NET
 12 Months Ended
Dec. 31, 2020
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, 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 

Catalyst, net includes $115.2 million and $74.5 million of indefinite-lived precious metal catalysts (both owned or financed as part of existing catalyst financing arrangements) as of December 31, 2020 and December 31, 2019, respectively.

The Company recorded amortization expense related to deferred turnaround costs, catalyst and intangible assets of $315.7 million, $256.8 million and $207.2 million for the years ended December 31, 2020, 2019 and 2018, respectively. Included in the current year 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, 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