Debt (Tables)

3 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Schedule of debt outstanding

The following table presents White Mountains’s debt outstanding as of March 31, 2018 and December 31, 2017:

Millions	March 31, 2018			Effective   Rate (1)	December 31, 2017			Effective   Rate (1)
WTM Bank Facility	$	—		N/A	$	—		N/A
Unamortized issue costs	—				—
WTM Bank Facility, carrying value	—				—
MediaAlpha Bank Facility	21.6			6.2%	23.9			5.6%
Unamortized issuance cost	(.1		)		(.1		)
MediaAlpha Bank Facility, carrying value	21.5				23.8
Total debt	$	21.5			$	23.8

 ⁽¹⁾ Effective rate considers the effect of the debt issuance costs.