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Fair Value of Financial Instruments
12 Months Ended
Dec. 31, 2012
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments
Fair Value of Financial Instruments

White Mountains carries its financial instruments on its balance sheet at fair value with the exception of its fixed-rate, long-term indebtedness and the SIG Preference Shares, which are recorded as non-controlling interest.
The following table summarizes the fair value and carrying value of financial instruments as of December 31, 2012 and 2011:
 
 
December 31, 2012
 
December 31, 2011
Millions
 
Fair
Value
 
Carrying
Value
 
Fair
Value
 
Carrying
Value
2012 OBH Senior Notes
 
$
282.4

 
$
274.7

 
$

 
$

2003 OBH Senior Notes
 

 

 
277.4

 
269.8

SIG Senior Notes
 
441.9

 
399.4

 
418.6

 
399.3

SIG Preference Shares
 
257.5

 
250.0

 
217.5

 
250.0


The fair value estimate for the 2012 and 2003 OBH Senior Senior Notes has been determined using quoted market prices and is considered a Level 2 measurement. The fair value estimates for the SIG Senior Notes and the SIG Preference Shares have been determined based on indicative broker quotes and is considered a Level 3 measurement.