Operating Leases - Balance Sheet Information (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Right of use assets, included in Other assets	$ 9.0	$ 12.6
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets	Other Assets
Operating lease liabilities, included in Other liabilities	$ 10.0	$ 13.6
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Other liabilities	Other liabilities
Weighted average remaining lease term	3 years 25 days	3 years 7 months 17 days
Weighted average discount rate	3.67%	3.75%