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Provisions for Impairments (Tables)
3 Months Ended
Mar. 31, 2021
Property, Plant and Equipment [Abstract]  
Schedule of provisions for impairment
The following table summarizes our provisions for impairment during the periods indicated below (dollars in millions):
Three months ended March 31,
20212020
Total provisions for impairment$2.7 $4.5 
Number of properties:
Classified as held for sale— 
Classified as held for investment
Sold10 15