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Retirement Benefits - Schedule of Net Benefit Costs (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost $ 0.0 $ 0.1 $ 0.0 $ 0.2
Interest cost 0.5 0.7 1.0 1.2
Expected return on plan assets (0.7) (1.0) (1.4) (1.8)
Amortization of net actuarial losses [1] 0.0 0.2 0.0 0.4
Net periodic pension cost $ (0.2) $ 0.0 $ (0.4) $ 0.0
[1] Reflects amounts reclassified from accumulated other comprehensive income to net income.