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Fair Value of Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2019
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, 2019 and 2018. 
 
DECEMBER 31, 2019
DECEMBER 31, 2018
Dollars in millions
CARRYING VALUE

FAIR VALUE

CARRYING VALUE

FAIR VALUE

Notes and bonds payable 1
$
1,414.1

$
1,425.8

$
1,346.0

$
1,326.5


1
Level 2 – model-derived valuations in which significant inputs and significant value drivers are observable in active markets.