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Debt (Tables)
 9 Months Ended
Sep. 30, 2014
Debt Disclosure [Abstract]  
Schedule of debt outstanding
White Mountains’s debt outstanding as of September 30, 2014 and December 31, 2013 consisted of the following:
Millions
 
September 30,
2014
 
December 31,
2013
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
 
(.4
)
 
(.4
)
SIG Senior Notes, carrying value
 
399.6

 
399.6

WTM Bank Facility
 
—

 
—

Old Lyme Note
 
2.8

 
2.1

QuoteLab
 
1.0

 
—

Total debt
 
$
678.1

 
$
676.4