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Asset Impairments and Assets Held for Sale (Notes)
 12 Months Ended
Dec. 31, 2021
Asset Impairment [Abstract]  
Asset Impairments Asset Impairments and Assets Held for Sale
We review our operating assets annually, or whenever indicators of impairment may be present. We considered the impact of COVID-19, and it did not have a material impact on our impairment results. The following table summarizes the components of asset impairments for the years ended December 31 (in millions):
202120202019
Attributable to Consolidated Assets
Rail North America
$2.4 $0.3 $0.4 
Portfolio Management
— — 6.2 
Total
$2.4 $0.3 $6.6 
Impairment losses recorded at Rail North America were primarily attributable to railcars and locomotives with declines in value due to excessive damage or functional obsolescence. Impairment losses recorded at Portfolio Management related to certain offshore marine supply vessels.

In the consolidated statements of comprehensive income, impairment losses related to consolidated assets were included in net gain on asset dispositions.
As of December 31, 2021 and December 31, 2020, assets held for sale were and $3.8 million and $4.8 million, all of which were at Rail North America. All assets held for sale at December 31, 2021, are expected to be sold in 2022.