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Fair Value of Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2020
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 September 30, 2020 and December 31, 2019.
 September 30, 2020December 31, 2019
Dollars in millionsCARRYING VALUEFAIR VALUECARRYING VALUEFAIR VALUE
Notes and bonds payable 1
$1,554.4 $1,621.7 $1,414.1 $1,425.8 
1Level 2 – model-derived valuations in which significant inputs and significant value drivers are observable in active markets.