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Investments in Unconsolidated Entities (Tables)
6 Months Ended
Jun. 30, 2018
Schedule of Equity Method Investments [Line Items]  
Investments in and Advances to Affiliates
The following table presents the carrying values of investments in equity method eligible unconsolidated entities recorded within other long-term investments:
Millions
 
June 30, 2018
 
December31, 2017
Equity method eligible private equity securities, at fair value
 
$
82.7

 
$
58.0

Investments, accounted for under the equity method
 
7.7

 
4.6

     Total investments in equity method eligible unconsolidated entities
 
90.4

 
62.6

Other unconsolidated investments (1)
 
165.1

 
146.2

     Total other long-term investments
 
$
255.5

 
$
208.8

(1) Consists of other long-term investments that are not equity method eligible.

Affiliated Entity  
Schedule of Equity Method Investments [Line Items]  
Equity Method Investments
The following table presents White Mountains’s investments in equity method eligible unconsolidated entities as of June 30, 2018 and December 31, 2017:
Investee
 
Ownership Interest
 
Instrument Held
 
 
June 30, 2018
 
December 31, 2017
 
 
PassportCard (1)
 
50.0%
 
50.0%
 
Common shares
DavidShield (1)
 
50.0%
 
 
Common shares
Kudu
 
49.5%
 
 
Units
durchblicker
 
45.0%
 
45.0%
 
Common shares
Compare.com
 
22.1%
 
22.1%
 
Common shares
OneTitle
 
20.0%
 
20.0%
 
Common shares
Tuckerman Capital Fund III
 
20.0%
 
21.3%
 
Units