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Loss and Loss Adjustment Expense Reserves (Tables)
 3 Months Ended
Mar. 31, 2016
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 and reinsurance subsidiaries for the three months ended March 31, 2016 and 2015:
 
 
Three Months Ended
 
 
March 31,
Millions
 
2016
 
2015
Gross beginning balance
 
$
1,395.8

 
$
1,350.0

Less beginning reinsurance recoverable on unpaid losses
 
(186.5
)
 
(161.7
)
Net loss and LAE reserves
 
1,209.3

 
1,188.3

 
 
 
 
 
Loss and LAE incurred relating to:
 
 
 
 
Current year losses
 
161.2

 
169.8

Prior year losses
 
(0.1
)
 
(1.9
)
Total incurred losses and LAE
 
161.1

 
167.9

 
 
 
 
 
Loss and LAE paid relating to:
 
 
 
 
Current year losses
 
(23.1
)
 
(23.3
)
Prior year losses
 
(148.6
)
 
(164.0
)
Total loss and LAE payments
 
(171.7
)
 
(187.3
)
 
 
 
 
 
Net ending balance
 
1,198.7

 
1,168.9

Plus ending reinsurance recoverable on unpaid losses
 
150.9

 
141.7

Gross ending balance
 
$
1,349.6

 
$
1,310.6