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Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 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 at June 30, 2012 and December 31, 2011.
 
June 30, 2012
 
December 31, 2011
 
Carrying
 
Fair
 
Carrying
 
Fair
(Dollars in millions)
value
 
value
 
value
 
value
Notes and bonds payable (1)
$
1,395.6


$
1,550.2


$
1,393.5


$
1,534.3

Mortgage notes receivable (2)
$
118.1


$
117.5


$
97.4


$
95.5

Notes receivable, net of allowances (2)
$
0.2


$
0.2


$
0.3


$
0.3