Pension and Postretirement Benefits (Pension Plans With Benefit Obligation in Excess of Plan Assets) (Details) - Pension Benefits - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 47.2	$ 3.2
Accumulated benefit obligation	$ 45.9	$ 3.0