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Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2012
Fair Value Disclosures [Abstract]  
Summary of the fair value and carrying value of financial instruments
The following table summarizes the fair value and carrying value of financial instruments as of June 30, 2012 and December 31, 2011:
 
 
 
June 30, 2012
 
December 31, 2011
Millions
 
Fair
Value
 
Carrying
Value
 
Fair
Value
 
Carrying
Value
OBH Senior Notes
 
$
277.6

 
$
269.8

 
$
277.4

 
$
269.8

SIG Senior Notes
 
420.0

 
399.4

 
418.6

 
399.3

SIG Preference Shares
 
240.0

 
250.0

 
217.5

 
250.0