Pension and Postretirement Benefits (Amounts Recognized on Consolidated and Combined Balance Sheets) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Accrued pension and postretirement benefits	$ (22.5)	$ (21.1)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Other assets	13.0	14.8
Accrued liabilities	(0.1)	(0.1)
Accrued pension and postretirement benefits	(7.0)	(3.2)
Funded status	5.9	11.5
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Other assets	0.0	0.0
Accrued liabilities	(1.3)	(1.8)
Accrued pension and postretirement benefits	(11.4)	(14.5)
Funded status	$ (12.7)	$ (16.3)