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Fair Value of Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2013
Fair Value Disclosures [Abstract]  
Summary of the fair value and carrying value of financial instruments
The following table summarizes the fair value and book value of financial instruments as of March 31, 2013 and December 31, 2012:
 
 
March 31, 2013
 
December 31, 2012
Millions
 
Fair
Value
 
Book
Value
 
Fair
Value
 
Book
Value
2012 OBH Senior Notes
 
$
287.8

 
$
274.7

 
$
282.4

 
$
274.7

SIG Senior Notes
 
454.0

 
399.4

 
441.9

 
399.4

SIG Preference Shares
 
262.5

 
250.0

 
257.5

 
250.0