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Summary of Significant Accounting Policies and Procedures (Tables)
 6 Months Ended
Jun. 30, 2021
Accounting Policies [Abstract]  
Schedule of reserves recorded as reduction of rental revenue The following table summarizes reserves recorded as a reduction of rental revenue (dollars in millions):
Three months ended June 30,Six months ended June 30,
2021202020212020
Rental revenue reserves$7.5 $6.4 $15.8 $7.4 
Straight-line rent reserves0.7 2.1 1.2 2.8 
Total rental revenue reserves$8.2 $8.5 $17.0 $10.2