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Fair Value of Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2021
Fair Value Disclosures [Abstract]  
Schedule of fair value and carrying values for notes and bonds payable, mortgage notes receivable and notes receivable
The table below details the fair value and carrying values for notes and bonds payable as of December 31, 2021 and 2020. 
 December 31, 2021December 31, 2020
Dollars in millionsCARRYING VALUEFAIR VALUECARRYING VALUEFAIR VALUE
Notes and bonds payable 1
$1,801.3 $1,797.4 $1,602.8 $1,645.4 
1Level 2 – model-derived valuations in which significant inputs and significant value drivers are observable in active markets.