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Retirement Benefits - Schedule of Net Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Interest cost $ 0.2 $ 0.5 $ 0.5 $ 1.1
Expected return on plan assets (0.2) (0.7) (0.6) (1.4)
Net periodic pension cost $ 0.0 $ (0.2) $ (0.1) $ (0.3)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]     Other comprehensive income Other comprehensive income