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Debt (Tables)
 3 Months Ended
Mar. 31, 2013
Debt Disclosure [Abstract]  
Schedule of debt outstanding
White Mountains’ debt outstanding as of March 31, 2013 and December 31, 2012 consisted of the following:
Millions
 
March 31,
2013
 
December 31,
2012
2012 OBH Senior Notes, at face value
 
$
275.0

 
$
275.0

Unamortized original issue discount
 
(.3
)
 
(.3
)
2012 OBH Senior Notes, carrying value
 
274.7

 
274.7

SIG Senior Notes, at face value
 
400.0

 
400.0

Unamortized original issue discount
 
(.6
)
 
(.6
)
SIG Senior Notes, carrying value
 
399.4

 
399.4

WTM Bank Facility
 
—

 
75.0

Old Lyme Note
 
2.1

 
2.1

Total debt
 
$
676.2

 
$
751.2