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Investments in Unconsolidated Entities (Tables)
9 Months Ended
Sep. 30, 2019
Schedule of Equity Method Investments [Line Items]  
Investments in and Advances to Affiliates The following table presents the carrying values of White Mountains’s equity method eligible investments recorded within other long-term investments as of September 30, 2019 and December 31, 2018:
Millions
 
September 30, 2019
 
December 31, 2018
Equity method eligible investments, at fair value
 
$
673.2

 
$
269.7

Other (1)
 
100.5

 
55.9

     Total other long-term investments
 
$
773.7

 
$
325.6

(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 significant equity method eligible investments as of September 30, 2019 and December 31, 2018:
 
 
Basic Ownership Interest
 
 
Investee
 
September 30, 2019
 
December 31, 2018
 
Instrument Held
PassportCard/DavidShield
 
50.0%
 
50.0%
 
Common shares
MediaAlpha (1)
 
48.3%
 
n/a
 
Units
durchblicker
 
45.0%
 
45.0%
 
Common shares
Elementum Holdings, L.P.
 
30.0%
 
n/a
 
Limited partnership interest
Tuckerman Capital Funds (2)
 
18.8 - 62.4%
 
18.5 - 62.3%
 
Limited and general partnership interests
Compare.com
 
18.4%
 
18.4%
 
Common shares
JAM Partners L.P.
 
11.1%
 
12.3%
 
Limited partnership interest
Enlightenment Capital Funds
 
10.0 - 36.5%
 
10.3 - 36.5%
 
Limited and general partnership interests
Kudu investments (3)
 
3.2 - 30.0%
 
n/a
 
Revenue and earnings participations
Kudu (3)
 
n/a
 
49.5%
 
Units
(1) As of December 31, 2018, MediaAlpha was a majority-owned consolidated subsidiary of White Mountains. See Note 2 — “Significant Transactions”
(2) Includes White Mountains’s direct investment in Galvanic Applied Sciences.
(3) As of September 30, 2019 White Mountains consolidates Kudu. See Note 2 — “Significant Transactions”.