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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 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 2.9 $ 3.6 $ 5.9 $ 7.4
Interest cost 3.0 2.4 6.2 4.8
Expected return on plan assets (3.4) (3.4) (6.9) (6.8)
Amortization of prior service cost   0.1   0.1
Recognized actuarial losses 3.7 5.6 7.5 11.0
Total $ 6.2 $ 8.3 $ 12.7 $ 16.5