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Pensions (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
U.S. Benefit Plans      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 0.0 $ 0.0 $ 0.0
Interest cost 7.8 7.6 7.9
Expected return on plan assets (10.3) (10.3) (9.1)
Amortization of actuarial loss 5.6 6.8 5.1
Total Company-sponsored plans 3.1 4.1 3.9
Multi-employer plans 0.1 0.2 0.2
Net periodic pension expense 3.2 4.3 4.1
Non-U.S. Benefit Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0.2 0.2 0.2
Interest cost 1.8 2.1 2.6
Expected return on plan assets (2.4) (2.7) (3.6)
Amortization of actuarial loss 0.6 0.7 0.4
Total Company-sponsored plans 0.2 0.3 (0.4)
Multi-employer plans 0.0 0.0 0.0
Net periodic pension expense $ 0.2 $ 0.3 $ (0.4)