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Loss and Loss Adjustment Expense Reserves (Tables)
 3 Months Ended
Mar. 31, 2013
Insurance Loss Reserves [Abstract]  
Loss and loss adjustment expense ("LAE") reserve activities
The following table summarizes the loss and loss adjustment expense (“LAE”) reserve activities of White Mountains’ insurance and reinsurance subsidiaries for the three months ended March 31, 2013 and 2012:
 
 
 
Three Months Ended
 
 
March 31,
Millions
 
2013
 
2012
Gross beginning balance
 
$
3,168.9

 
$
5,702.3

Less beginning reinsurance recoverable on unpaid losses
 
(429.1
)
 
(2,507.3
)
Net loss and LAE reserves
 
2,739.8

 
3,195.0

 
 
 
 
 
Less:  Beginning net loss and LAE reserves for
     OneBeacon's runoff business (1)
 
—

 
(383.3
)
 
 
 
 
 
Loss and LAE reserves acquired - American Fuji
 
21.3

 
—

 
 
 
 
 
Loss and LAE incurred relating to:
 
 

 
 

Current year losses
 
242.9

 
257.4

Prior year losses
 
1.4

 
(7.6
)
Total incurred losses and LAE
 
244.3

 
249.8

 
 
 
 
 
Accretion of fair value adjustment to loss and LAE reserves
 
1.2

 
7.1

Foreign currency translation adjustment to loss and LAE reserves
 
(9.6
)
 
11.8

 
 
 
 
 
Loss and LAE paid relating to:
 
 

 
 

Current year losses
 
(36.6
)
 
(44.5
)
Prior year losses
 
(270.6
)
 
(322.9
)
Total loss and LAE payments
 
(307.2
)
 
(367.4
)
 
 
 
 
 
Plus:  Ending net loss and LAE reserves for
OneBeacon's runoff business (1)
 
—

 
332.4

 
 
 
 
 
Net ending balance
 
2,689.8

 
3,045.4

Plus ending reinsurance recoverable on unpaid losses
 
410.8

 
2,465.4

Gross ending balance
 
$
3,100.6

 
$
5,510.8

(1) Loss and LAE reserve balances for OneBeacon's run-off business prior to September 30, 2012 were not classified as held for sale.  Adjustment is to present loss and LAE reserve activities from continuing operations.