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Gain on Sales of Real Estate
 9 Months Ended
Sep. 30, 2021
Gain (Loss) on Sale of Investments [Abstract]  
Gain on Sales of Real Estate Gain on Sales of Real Estate
The following table summarizes our properties sold during the periods indicated below (dollars in millions):
Three months ended September 30,Nine months ended September 30,
2021202020212020
Number of properties27 37 96 66 
Net sales proceeds$31.9 $51.3 $123.5 $184.9 
Gain on sales of real estate$12.1 $13.7 $35.4 $53.6