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Retirement Plans - Summary of Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Pensions        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost $ 0.4 $ 0.4 $ 0.8 $ 0.7
Interest cost 0.3 0.2 0.6 0.5
Expected return on plan assets (0.3) (0.2) (0.6) (0.5)
Amortization of net actuarial and other (gain) loss 0.0 0.0 0.0 0.0
Net periodic benefit cost (income) 0.4 0.4 0.8 0.7
Other Benefits        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
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 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