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Retirement Plans - Summary of Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Pensions        
Components of net periodic benefit cost (income):        
Service cost $ 0.4 $ 0.4 $ 1.2 $ 1.3
Interest cost 0.3 0.3 0.9 0.8
Expected return on plan assets (0.4) (0.3) (1.3) (1.0)
Amortization of prior service cost (credit) 0.0 0.0 0.1 0.1
Amortization of net actuarial and other (gain) loss 0.0 0.0 0.0 0.0
Net periodic benefit cost (income) 0.3 0.4 0.9 1.2
Other Benefits        
Components of net periodic benefit cost (income):        
Service cost 0.0 0.0 0.0 0.0
Interest cost 0.0 0.0 0.0 0.0
Expected return on plan assets 0.0 0.0 0.0 0.0
Amortization of prior service cost (credit) 0.0 0.0 0.0 0.0
Amortization of net actuarial and other (gain) loss 0.0 0.0 0.0 0.0
Net periodic benefit cost (income) $ 0.0 $ 0.0 $ 0.0 $ 0.0