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Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2019
Fair Value Disclosures [Abstract]  
Summary of the fair value and carrying value of financial instruments
 
 
December 31, 2019
 
December 31, 2018
Millions
 
Fair Value
 
Carrying Value
 
Fair Value
 
Carrying Value
NSM Bank Facility
 
$
221.2

 
$
217.4

 
$
176.1

 
$
176.6

Other NSM debt
 
$
1.7

 
$
1.8

 
$
1.9

 
$
1.9

Kudu Bank Facility (1)
 
$
53.6

 
$
53.6

 
$

 
$

MediaAlpha Bank Facility
 
$

 
$

 
$
14.6

 
$
14.2

Other Operations debt
 
$
11.3

 
$
10.7

 
$

 
$