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Retirement Benefits - Schedule of Net Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]    
Service cost $ 0.0 $ 0.1
Interest cost 0.5 0.5
Expected return on plan assets (0.7) (0.8)
Amortization of net actuarial losses [1] 0.0 0.2
Net periodic pension cost $ (0.2) $ 0.0
[1] Reflects amounts reclassified from accumulated other comprehensive income to net income.