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Pension Plans - Plan Net Pension Credit (Detail) - United Kingdom [Member] - Foreign Pension Plan [Member] - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Plan net pension credit/(charge):    
Service cost $ (0.2) $ (0.2)
Interest cost on projected benefit obligation (3.7) (5.4)
Expected return on plan assets 5.9 7.8
Amortization of prior service credit 0.3 0.3
Amortization of actuarial net losses (1.2) (0.7)
Net pension credit total $ 1.1 $ 1.8