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Pension and Postretirement Benefits - Components of Net Periodic Benefit Expense (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 1.6 $ 1.8
Interest cost 69.9 80.5
Expected return on plan assets (89.4) (99.4)
Amortization of prior service benefit (1.3) (1.4)
Recognized net actuarial loss 43.7 38.8
Net periodic pension/postretirement benefit expense 24.5 20.3
U.S. Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0.0 0.0
Interest cost 52.5 57.6
Expected return on plan assets (58.8) (63.4)
Amortization of prior service benefit (0.6) (0.6)
Recognized net actuarial loss 30.9 28.7
Net periodic pension/postretirement benefit expense 24.0 22.3
International Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 1.6 1.8
Interest cost 17.4 22.9
Expected return on plan assets (30.6) (36.0)
Amortization of prior service benefit (0.7) (0.8)
Recognized net actuarial loss 12.8 10.1
Net periodic pension/postretirement benefit expense 0.5 (2.0)
Other Postretirement Benefit Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0.1 0.1
Interest cost 1.5 1.6
Expected return on plan assets (0.1) (0.1)
Amortization of prior service benefit (0.1) 0.0
Recognized net actuarial loss 0.3 0.3
Net periodic pension/postretirement benefit expense $ 1.7 $ 1.9