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Pensions - Components of Net Pension Income (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Retirement Benefits [Abstract]        
Service cost $ 0.3 $ 0.2 $ 0.8 $ 0.7
Interest cost 0.3 0.3 1.0 0.9
Expected return on plan assets (0.3) (0.3) (0.9) (0.9)
Amortization of unrecognized loss 0.1 0.0 0.2 0.1
Amortization of prior service cost 0.0 0.0 0.1 0.1
Defined benefit plan expense before settlement income 0.4 0.2 1.2 0.9
Settlement income 0.0 0.0 0.0 (6.0)
Total pension expense (income) $ 0.4 $ 0.2 $ 1.2 $ (5.1)