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Pensions - Components of Net Pension Income (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Retirement Benefits [Abstract]        
Service cost $ 0.2 $ 0.2 $ 0.5 $ 0.5
Interest cost 0.4 0.3 0.7 0.6
Expected return on plan assets (0.3) (0.3) (0.6) (0.6)
Amortization of unrecognized loss 0.0 0.1 0.1 0.1
Amortization of prior service cost 0.1 0.1 0.1 0.1
Defined benefit plan expense before settlement income 0.4 0.4 0.8 0.7
Settlement income 0.0 (6.0) 0.0 (6.0)
Total pension expense (income) $ 0.4 $ (5.6) $ 0.8 $ (5.3)