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Components of Company's Net Pension Expense (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Pension and Other Postretirement Benefits Disclosure [Line Items]      
Total recognized in other comprehensive loss $ (12.1) $ 9.0 $ (1.0)
Pension Plans, Defined Benefit      
Pension and Other Postretirement Benefits Disclosure [Line Items]      
Service cost 1.8 1.8 1.9
Interest cost 30.0 30.6 37.6
Expected return on plan assets (58.4) (55.9) (57.5)
Net actuarial loss (gain) 17.9 17.7 19.1
Prior service cost (0.4) (1.1) (1.0)
Curtailment and other one-time charges 0.0 0.0 0.0
Defined-benefit plan (income) cost (9.1) (6.9) 0.1
Various U.S. defined contribution plans cost 12.0 11.6 10.8
Defined Benefit Plan And Defined Contribution Plan Periodic Benefit Cost, Total 2.9 4.7 10.9
Other changes in plan assets and projected benefit obligation recognized in other comprehensive loss Net actuarial (gain) loss (3.8) 29.9 17.2
Amortization of net actuarial (loss) gain (17.9) (17.7) (19.1)
Prior service cost   0.6 2.5
Amortization of prior service cost 0.5 1.1 1.0
Total recognized in other comprehensive loss (21.2) 13.9 1.6
Total recognized in net periodic (benefit) cost and other comprehensive loss (30.3) 7.0 1.7
Post-Retirement Benefits      
Pension and Other Postretirement Benefits Disclosure [Line Items]      
Service cost 0.1 0.1 0.1
Interest cost 0.3 0.2 0.3
Net actuarial loss (gain) (0.1) (0.2) (0.1)
Prior service cost (0.4) (0.4) (0.4)
Curtailment and other one-time charges 0.0 0.0 0.0
Defined-benefit plan (income) cost (0.1) (0.3) (0.1)
Other changes in plan assets and projected benefit obligation recognized in other comprehensive loss Net actuarial (gain) loss 1.1 0.2  
Amortization of net actuarial (loss) gain 0.1 0.2 0.1
Prior service cost     (3.7)
Amortization of prior service cost 0.4 0.4 0.4
Total recognized in other comprehensive loss 1.6 0.8 (3.2)
Total recognized in net periodic (benefit) cost and other comprehensive loss $ 1.5 $ 0.5 $ (3.3)