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Fair Value of Financial Instruments (Tables)
 3 Months Ended
Mar. 31, 2022
Fair Value Disclosures [Abstract]  
Fair value and carrying values for notes and bonds payable, mortgage notes receivable, and notes receivable
The table below details the fair values and carrying values for notes and bonds payable at March 31, 2022 and December 31, 2021.
 March 31, 2022December 31, 2021
Dollars in millionsCARRYING VALUEFAIR VALUECARRYING VALUEFAIR VALUE
Notes and bonds payable 1
$1,907.4 $1,837.7 $1,801.3 $1,797.4 
1Level 2 – model-derived valuations in which significant inputs and significant value drivers are observable in active markets.