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Fair Value of Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2013
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, mortgage notes receivable and notes receivable as of December 31, 2013 and 2012. 
 
December 31, 2013
 
December 31, 2012
(Dollars in millions)
Carrying
Value

 
Fair
Value

 
Carrying
Value

 
Fair
Value

Notes and bonds payable (1)
$
1,348.5

 
$
1,380.6

 
$
1,293.0

 
$
1,437.2

Mortgage notes receivable (2)
$
125.5

 
$
124.5

 
$
162.2

 
$
158.3

Notes receivable, net of allowances (2)
$
0.1

 
$
0.1

 
$
0.1

 
$
0.1


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(1) Level 3 - Fair value derived from valuation techniques in which one of more significant inputs or significant value drivers are unobservable.
(2) Level 2 - Fair value based on quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-driven valuations in which significant inputs and significant value drivers are observable in active markets.