Leases - Schedule of Right-of-Use Assets and Lease Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Lessee, Lease, Description [Line Items]
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Other assets	Other assets
ROU lease asset	$ 25.2	$ 28.1
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Other liabilities	Other liabilities
Lease liability	$ 27.1	$ 30.0
Weighted Average Incremental Borrowing Rate	4.10%	4.00%
HG/BAM
Lessee, Lease, Description [Line Items]
ROU lease asset	$ 5.7	$ 7.6
Lease liability	6.2	8.1
Ark
Lessee, Lease, Description [Line Items]
ROU lease asset	6.6	7.0
Lease liability	6.6	7.0
Kudu
Lessee, Lease, Description [Line Items]
ROU lease asset	5.8	6.4
Lease liability	6.5	7.1
Other Operations
Lessee, Lease, Description [Line Items]
ROU lease asset	7.1	7.1
Lease liability	$ 7.8	$ 7.8