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Investments in Unconsolidated Affiliates (Tables)
6 Months Ended
Jun. 30, 2016
Equity Method Investments and Joint Ventures [Abstract]  
Schedule of Changes in Investments in Unconsolidated Affiliates
The following table summarizes amounts recorded by White Mountains under the equity method relating to its investment in Symetra for the three and six months ended June 30, 2015:
 
 
Three Months Ended
 
Six Months Ended
Millions
 
June 30, 2015
 
June 30, 2015
Equity method carrying value of investment in Symetra at the beginning of the period
 
$
447.3

 
$
411.4

Equity in earnings (1)(2)
 
6.1

 
13.3

 Equity in net unrealized losses from Symetra’s fixed maturity portfolio (3)
 
(66.4
)
 
(35.5
)
Dividends received
 
(2.2
)
 
(4.4
)
 Distribution from Prospector Offshore Fund
 
12.4

 
12.4

Equity method carrying value of investment in Symetra at the end of the period(4)
 
$
397.2

 
$
397.2


(1) For the three and six months ended June 30, 2015, equity in earnings excludes tax expense of $0.4 and $0.8.
(2) For the three and six months ended June 30, 2015, equity in earnings includes $0.7 and $1.4 increase relating to the pre-tax amortization of the Symetra common share basis difference.
(3) For the three and six months ended June 30, 2015, net unrealized gains includes $2.8 and $5.7 increase relating to the pre-tax amortization of the Symetra common share basis difference.
(4) Includes White Mountains’s equity in net unrealized gains from Symetra’s fixed maturity portfolio of $2.0 as of June 30, 2015, which excludes tax expense of $0.0.