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Defined Benefit Pension Plans - Components of Net Periodic Defined Benefit Pension Benefit Cost (Detail) - Defined Benefit Pension Plans - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 2.8 $ 3.7 $ 8.7 $ 11.1
Interest cost 3.0 2.5 9.2 7.3
Expected return on plan assets (3.5) (3.3) (10.4) (10.1)
Amortization of prior service cost       0.1
Recognized actuarial losses 3.6 5.3 11.1 16.3
Total $ 5.9 $ 8.2 $ 18.6 $ 24.7