Debt (Tables)

9 Months Ended

Sep. 30, 2013

Debt Disclosure [Abstract]

Schedule of debt outstanding

White Mountains’ debt outstanding as of September 30, 2013 and December 31, 2012 consisted of the following:

Millions	September 30, 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	(.5		)	(.6		)
SIG Senior Notes, carrying value	399.5			399.4
WTM Bank Facility	—			—
Previous WTM Bank Facility	—			75.0
Old Lyme Note	2.1			2.1
Total debt	$	676.3		$	751.2