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Loss and Loss Adjustment Expense Reserves (Tables)
 6 Months Ended
Jun. 30, 2012
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 and six months ended June 30, 2012 and 2011:
 
 
 
Three Months Ended
 
Six Months Ended
 
 
June 30,
 
June 30,
Millions
 
2012
 
2011
 
2012
 
2011
Gross beginning balance
 
$
5,510.8

 
$
5,759.8

 
$
5,702.3

 
$
5,736.8

Less beginning reinsurance recoverable on unpaid losses
 
(2,465.4
)
 
(2,304.2
)
 
(2,507.3
)
 
(2,344.0
)
Net loss and LAE reserves
 
3,045.4

 
3,455.6

 
3,195.0

 
3,392.8

 
 
 
 
 
 
 
 
 
Less:  Beginning net loss and LAE reserves for AutoOne (1)
 
—

 
(72.7
)
 
—

 
(77.3
)
 
 
 
 
 
 
 
 
 
Loss and LAE incurred relating to:
 
 

 
 

 
 

 
 

Current year losses
 
268.4

 
288.7

 
526.3

 
664.4

Prior year losses
 
(3.4
)
 
(10.2
)
 
1.4

 
(27.5
)
Total incurred losses and LAE
 
265.0

 
278.5

 
527.7

 
636.9

 
 
 
 
 
 
 
 
 
Accretion of fair value adjustment to loss and LAE reserves
 
1.2

 
2.0

 
8.3

 
4.1

Foreign currency translation adjustment to loss and LAE reserves
 
(12.1
)
 
10.1

 
(.3
)
 
31.2

 
 
 
 
 
 
 
 
 
Loss and LAE paid relating to:
 
 

 
 

 
 

 
 

Current year losses
 
(80.9
)
 
(80.6
)
 
(127.6
)
 
(125.1
)
Prior year losses
 
(258.2
)
 
(211.3
)
 
(642.7
)
 
(481.0
)
Total loss and LAE payments
 
(339.1
)
 
(291.9
)
 
(770.3
)
 
(606.1
)
 
 
 
 
 
 
 
 
 
Plus:  Ending net loss and LAE reserves for AutoOne (1)
 
—

 
67.7

 
—

 
67.7

 
 
 
 
 
 
 
 
 
Net ending balance
 
2,960.4

 
3,449.3

 
2,960.4

 
3,449.3

Plus ending reinsurance recoverable on unpaid losses
 
2,369.4

 
2,193.1

 
2,369.4

 
2,193.1

Gross ending balance
 
$
5,329.8

 
$
5,642.4

 
$
5,329.8

 
$
5,642.4