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Defined Contribution and Defined Benefit Retirement - Components of Net Periodic Defined Benefit Pension Benefit Cost (Credit) (Detail) - Defined Benefit Pension Plans - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Interest cost $ 2.3 $ 2.2 $ 2.5
Expected return on plan assets (2.3) (3.4) (3.3)
Amortization of unrecognized net actuarial loss 2.2 2.0 2.0
Total 2.2 0.8 1.2
Foreign      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 12.8 11.6 11.4
Interest cost 13.5 13.8 13.4
Settlement loss     0.1
Expected return on plan assets (11.9) (12.7) (9.7)
Amortization of unrecognized prior service credit 0.2 0.2 0.3
Amortization of unrecognized net actuarial loss 12.8 13.2 13.2
Total $ 27.4 $ 26.1 $ 28.7