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Investments in Unconsolidated Affiliates (Tables)
 3 Months Ended
Mar. 31, 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 months ended March 31, 2015:
 
 
Three Months Ended
Millions
 
March 31, 2015
Equity method carrying value of investment in Symetra as of December 31, 2014
 
$
411.4

Equity in earnings (1)(2)
 
7.2

 Equity in net unrealized gains from Symetra’s fixed maturity portfolio (3)
 
30.9

Dividends received
 
(2.2
)
Equity method carrying value of investment in Symetra as of March 31, 2015(4)
 
$
447.3


(1) Equity in earnings excludes tax expense of $0.4.
(2) Equity in earnings includes $0.7 increase relating to the pre-tax amortization of the Symetra common share basis difference.
(3) Net unrealized gains includes $2.9 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 $68.4 as of March 31, 2015, which excludes tax expense of $4.6.