Commitments and Contingencies Future Lease Payments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Operating Leases, Future Minimum Payments Due [Abstract]
Lessee, Operating Lease, Liability, to be Paid, Year One	$ 3.3
Lessee, Operating Lease, Liability, to be Paid, Year Two	3.3
Lessee, Operating Lease, Liability, to be Paid, Year Three	3.2
Lessee, Operating Lease, Liability, to be Paid, Year Four	3.1
Lessee, Operating Lease, Liability, to be Paid, Year Five	2.8
Lessee, Operating Lease, Liability, to be Paid, after Year Five	1.9
Lessee, Operating Lease, Liability, to be Paid	17.6
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(1.0)
Operating lease liability	16.6	$ 19.9
Finance Lease, Liability, Payment, Due [Abstract]
Finance Lease, Liability, to be Paid, Year One	0.1
Finance Lease, Liability, to be Paid, Year Two	0.2
Finance Lease, Liability, to be Paid, Year Three	0.1
Finance Lease, Liability, to be Paid, Year Four	0.1
Finance Lease, Liability, to be Paid, Year Five	0.0
Finance Lease, Liability, to be Paid, after Year Five	0.0
Finance Lease, Liability, Payment, Due	0.5
Finance Lease, Liability, Undiscounted Excess Amount	0.0
Other liabilities	$ 0.5	$ 0.4