Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2024

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 March 31, 2024 and December 31, 2023:

	March 31, 2024				December 31, 2023
Millions	Fair Value		Carrying Value		Fair Value		Carrying Value
Ark 2007 Subordinated Notes	$	—	$	—	$	30.5	$	30.0
Ark 2021 Subordinated Notes	$	171.8	$	155.4	$	171.8	$	155.5
HG Global Senior Notes	$	158.5	$	147.0	$	158.7	$	146.9
Kudu Credit Facility	$	224.6	$	203.8	$	225.6	$	203.8
Other Operations debt	$	27.4	$	25.9	$	30.0	$	28.4