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Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2021
Fair Value Disclosures [Abstract]  
Schedule of the fair value and carrying value of financial instruments The following tables presents the fair value and carrying value of these financial instruments as of December 31, 2021 and 2020:
December 31, 2021December 31, 2020
MillionsFair ValueCarrying ValueFair ValueCarrying Value
Ark 2007 Subordinated Notes$27.6 $30.0 $— $— 
Ark 2021 Subordinated Notes$162.8 $155.9 $— $— 
NSM Bank Facility$275.8 $271.2 $279.3 $271.3 
Other NSM debt$1.0 $.9 $1.3 $1.3 
Kudu Credit Facility$246.8 $218.2 $— $— 
Kudu Bank Facility$ $ $89.3 $86.3 
Other Operations debt$17.7 $16.8 $18.8 $17.5