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Gain on Sales of Real Estate
 9 Months Ended
Sep. 30, 2020
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,
2020201920202019
Number of properties37 27 66 64 
Net sales proceeds$51.3 $21.5 $184.9 $72.6 
Gain on sales of real estate$13.7 $1.7 $53.6 $15.8