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Loss and Loss Adjustment Expense Reserves (Tables)
 3 Months Ended
Mar. 31, 2017
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, 2017 and 2016:
 
 
Three Months Ended
 
 
March 31,
Millions
 
2017
 
2016
Gross beginning balance
 
$
1,365.6

 
$
1,389.8

Less beginning reinsurance recoverable on unpaid losses
 
(172.9
)
 
(186.0
)
Net loss and LAE reserves
 
1,192.7

 
1,203.8

 
 
 
 
 
Add: SSIE reserves held for sale at beginning of the period (1)
 
4.7

 
5.5

 
 
 
 
 
Loss and LAE incurred relating to:
 
 
 
 
Current year losses
 
151.7

 
161.2

Prior year losses
 
—

 
(.1
)
Total incurred losses and LAE
 
151.7

 
161.1

 
 
 
 
 
Loss and LAE paid relating to:
 
 
 
 
Current year losses
 
(21.5
)
 
(23.1
)
Prior year losses
 
(129.1
)
 
(148.6
)
Total loss and LAE payments
 
(150.6
)
 
(171.7
)
 
 
 
 
 
Less: Deconsolidation of SSIE (1)
 
4.4

 
—

 
 
 
 
 
Less: SSIE reserves held for sale at end of the period (1)
 
—

 
5.3

 
 
 
 
 
Net ending balance
 
1,194.1

 
1,193.4

Plus ending reinsurance recoverable on unpaid losses
 
174.7

 
150.4

Gross ending balance
 
$
1,368.8

 
$
1,343.8

(1) Resulting from the sale of Star & Shield in the first quarter of 2017, SSIE is no longer consolidated. See Note 17 — “Held for Sale and Discontinued Operations”.