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Gain on Sales of Real Estate (Tables)
6 Months Ended
Jun. 30, 2021
Gain (Loss) on Sale of Investments [Abstract]  
Schedule of properties sold
The following table summarizes our properties sold during the periods indicated below (dollars in millions):
Three months ended June 30,Six months ended June 30,
2021202020212020
Number of properties42 12 69 29 
Net sales proceeds$56.9 $7.4 $91.6 $133.6 
Gain on sales of real estate$14.9 $1.3 $23.3 $39.8