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Gain on Sales of Real Estate
 3 Months Ended
Mar. 31, 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 March 31,
20212020
Number of properties27 17 
Net sales proceeds$34.7 $126.2 
Gain on sales of real estate$8.4 $38.5