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Fair Value of Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]  
Summary of the fair value and carrying value of financial instruments The following table presents the fair value and carrying value of these financial instruments as of September 30, 2021 and December 31, 2020:
 September 30, 2021December 31, 2020
MillionsFair
Value
Carrying
Value
Fair
Value
Carrying
Value
Ark 2007 Subordinated Notes$42.0 $43.9 $— $— 
Ark 2021 Subordinated Notes$163.1 $156.8 $— $— 
NSM Bank Facility$300.6 $293.7 $279.3 $271.3 
Other NSM debt$1.3 $1.3 $1.3 $1.3 
Kudu Credit Facility$218.2 $195.6 $— $— 
Kudu Bank Facility$ $ $89.3 $86.3 
Other Operations debt$20.5 $19.1 $18.8 $17.5