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Fair Value of Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2022
Fair Value Disclosures [Abstract]  
Summary 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 September 30, 2022 and December 31, 2021:
 September 30, 2022December 31, 2021
MillionsFair
Value
Carrying
Value
Fair
Value
Carrying
Value
HG Global Senior Notes$146.1 $146.4 $— $— 
Ark 2007 Subordinated Notes$26.2 $30.0 $27.6 $30.0 
Ark 2021 Subordinated Notes$149.4 $150.0 $162.8 $155.9 
Kudu Credit Facility$265.5 $253.5 $246.8 $218.2 
Other Operations debt$36.8 $35.6 $17.7 $16.8