Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2017

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 value and carrying values for notes and bonds payable as of December 31, 2017 and 2016.

	December 31, 2017				December 31, 2016
(Dollars in millions)	Carrying Value		Fair Value		Carrying Value		Fair Value
Notes and bonds payable (1)	$	1,283.9	$	1,269.7	$	1,264.4	$	1,265.1

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