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Loss and Loss Adjustment Expense Reserves (Tables)
 9 Months Ended
Sep. 30, 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 and nine months ended September 30, 2016 and 2015:
 
 
Three Months Ended
 
Nine Months Ended
 
 
September 30,
 
September 30,
Millions
 
2016
 
2015
 
2016
 
2015
Gross beginning balance
 
$
1,376.6

 
$
1,350.8

 
$
1,389.8

 
$
1,342.2

Less beginning reinsurance recoverable on unpaid losses
 
(162.8
)
 
(147.1
)
 
(186.0
)
 
(161.6
)
Net loss and LAE reserves
 
1,213.8

 
1,203.7

 
1,203.8

 
1,180.6

 
 
 
 
 
 
 
 
 
SSIE reserves held for sale at beginning of the period (1)
 
5.3

 
6.1

 
5.5

 
7.7

 
 
 
 
 
 
 
 
 
Loss and LAE incurred relating to:
 
 
 
 
 
 

 
 

Current year losses
 
164.9

 
170.4

 
492.8

 
536.7

Prior year losses
 
0.1

 
(.4
)
 
15.3

 
(2.6
)
Total incurred losses and LAE
 
165.0

 
170.0

 
508.1

 
534.1

 
 
 
 
 
 
 
 
 
Loss and LAE paid relating to:
 
 
 
 
 
 

 
 

Current year losses
 
(55.0
)
 
(53.0
)
 
(116.2
)
 
(120.2
)
Prior year losses
 
(131.1
)
 
(108.1
)
 
(403.2
)
 
(383.5
)
Total loss and LAE payments
 
(186.1
)
 
(161.1
)
 
(519.4
)
 
(503.7
)
 
 
 
 
 
 
 
 
 
SSIE reserves held for sale at end of the period (1)
 
(5.4
)
 
(5.5
)
 
(5.4
)
 
(5.5
)
 
 
 
 
 
 
 
 
 
Net ending balance
 
1,192.6

 
1,213.2

 
1,192.6

 
1,213.2

Plus ending reinsurance recoverable on unpaid losses
 
169.4

 
214.2

 
169.4

 
214.2

Gross ending balance
 
$
1,362.0

 
$
1,427.4

 
$
1,362.0

 
$
1,427.4

(1) See Note 17 - “Held for Sale and Discontinued Operations”.