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Loss and Loss Adjustment Expense Reserves (Tables)
 9 Months Ended
Sep. 30, 2015
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’s insurance subsidiaries for the three and nine months ended September 30, 2015 and 2014:
 
 
Three Months Ended
 
Nine Months Ended
 
 
September 30,
 
September 30,
Millions
 
2015
 
2014
 
2015
 
2014
Gross beginning balance
 
$
1,357.0

 
$
1,137.8

 
$
1,350.0

 
$
1,054.3

Less beginning reinsurance recoverable on unpaid losses
 
(147.2
)
 
(92.1
)
 
(161.7
)
 
(80.2
)
Net loss and LAE reserves
 
1,209.8

 
1,045.7

 
1,188.3

 
974.1

 
 
 
 
 
 
 
 
 
Loss and LAE reserves consolidated — SSIE
 
—

 
—

 
—

 
13.6

 
 
 
 
 
 
 
 
 
Loss and LAE incurred relating to:
 
 
 
 
 
 

 
 

Current year losses
 
170.4

 
178.4

 
536.7

 
511.0

Prior year losses
 
(0.4
)
 
7.1

 
(2.6
)
 
16.3

Total incurred losses and LAE
 
170.0

 
185.5

 
534.1

 
527.3

 
 
 
 
 
 
 
 
 
Loss and LAE paid relating to:
 
 
 
 
 
 

 
 

Current year losses
 
(53.0
)
 
(55.9
)
 
(120.2
)
 
(116.5
)
Prior year losses
 
(108.1
)
 
(107.3
)
 
(383.5
)
 
(330.5
)
Total loss and LAE payments
 
(161.1
)
 
(163.2
)
 
(503.7
)
 
(447.0
)
 
 
 
 
 
 
 
 
 
Net ending balance
 
1,218.7

 
1,068.0

 
1,218.7

 
1,068.0

Plus ending reinsurance recoverable on unpaid losses
 
214.6

 
101.5

 
214.6

 
101.5

Gross ending balance
 
$
1,433.3

 
$
1,169.5

 
$
1,433.3

 
$
1,169.5