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Fair Value of Financial Instruments (Tables)
9 Months Ended
Sep. 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 September 30, 2012 and December 31, 2011:
 
 
 
September 30, 2012
 
December 31, 2011
Millions
 
Fair
Value
 
Carrying
Value
 
Fair
Value
 
Carrying
Value
OBH Senior Notes
 
$
276.3

 
$
269.8

 
$
277.4

 
$
269.8

SIG Senior Notes
 
442.9

 
399.4

 
418.6

 
399.3

SIG Preference Shares
 
257.5

 
250.0

 
217.5

 
250.0