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Pension Plans - Plan Net Pension Credit (Detail) - United Kingdom [Member] - Foreign Pension Plan [Member] - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Plan net pension credit/(charge):        
Service cost $ (0.3) $ (0.3) $ (0.5) $ (0.5)
Interest cost on projected benefit obligation (3.7) (5.6) (7.4) (11.0)
Expected return on plan assets 6.1 8.0 12.0 15.8
Amortization of prior service credit 0.2 0.3 0.5 0.6
Amortization of actuarial net losses (1.3) (0.7) (2.5) (1.4)
Net pension credit total $ 1.0 $ 1.7 $ 2.1 $ 3.5