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Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2012
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, 2012 and 2011. 
 
December 31, 2012
 
December 31, 2011
(Dollars in millions)
Carrying
Value
 
Fair
Value
 
Carrying
Value
 
Fair
Value
Notes and bonds payable (1)
$
1,293.0

 
$
1,437.2

 
$
1,393.5

 
$
1,534.3

Mortgage notes receivable (2)
$
162.2

 
$
158.3

 
$
97.4

 
$
95.5

Notes receivable, net of allowances (2)
$
0.1

 
$
0.1

 
$
0.3

 
$
0.3