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Fair Value of Financial Instruments (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 2022 and December 31, 2021:
 March 31, 2022December 31, 2021
MillionsFair
Value		Carrying
Value		Fair
Value		Carrying
Value
Ark 2007 Subordinated Notes$27.8 $30.0 $27.6 $30.0 
Ark 2021 Subordinated Notes$163.4 $154.8 $162.8 $155.9 
NSM Bank Facility$273.1 $270.0 $275.8 $271.2 
Other NSM debt$.7 $.6 $1.0 $.9 
Kudu Credit Facility$241.8 $218.2 $246.8 $218.2 
Other Operations debt$17.7 $17.3 $17.7 $16.8