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Impairments (Tables)
 6 Months Ended
Jun. 30, 2020
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 June 30,Six months ended June 30,
2020201920202019
Total provisions for impairment$13.9  $13.1  $18.3  $17.7  
Number of properties:
Classified as held for sale7  —  8  —  
Classified as held for investment11  2  14  2  
Sold7  12  14  22