Retirement and Other Postretirement Benefit Plans - Schedule of Net Periodic Benefit Costs of Defined Benefit Retirement Plans (Details) - Defined Benefit Retirement Plans - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
U.S.
Net periodic benefit costs of defined benefit retirement plans
Service cost	$ 0.0	$ 0.3
Interest cost	0.2	0.1
Net amortization and deferral	(0.1)	0.2
Net periodic benefit cost	$ 0.1	$ 0.6
Defined Benefit Plan, Tax Status [Extensible List]	Non qualified	Non qualified	Non qualified
European
Net periodic benefit costs of defined benefit retirement plans
Service cost	$ 0.2	$ 0.2
Interest cost	0.1	1.2
Expected return on plan assets	0.0	(1.2)
Net amortization and deferral	0.0	0.6
Net periodic benefit cost	$ 0.3	$ 0.8