Income Taxes (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Operating Loss Carryforwards [Line Items]
Unrecognized tax benefits that would impact effective tax rate	$ 4.8
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	299.2	$ 206.9
Credit carryforwards	5.9	3.9
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	554.7	431.0
Credit carryforwards	$ 4.6	$ 3.6