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Employee Retirement Benefits - Net Periodic Costs (Benefits) (Details) - Pension - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]      
Interest cost $ 4.5 $ 4.1 $ 5.1
Expected return on plan assets (5.4) (6.5) (6.1)
Net amortization of actuarial net loss 0.0 0.5 0.7
Settlement loss 1.9 0.6 1.0
Net periodic pension cost (benefit) $ 1.0 $ (1.3) $ 0.7
Weighted‑Average Assumptions Used to Determine Net Periodic Pension Cost (Benefit)      
Discount rate 2.70% 2.30% 3.20%
Expected return on assets 4.60% 4.80% 5.20%
Average rate of increase in compensation 0.00% 0.00% 0.00%
Interest credit rate 3.80% 3.80% 3.80%