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Pension and Postretirement Benefits - Components of Net Periodic Benefit Expense (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1.0 $ 1.8 $ 4.2 $ 5.7
Interest cost 71.4 79.3 212.2 241.2
Expected return on plan assets (91.2) (97.2) (270.7) (296.6)
Amortization of prior service benefit (1.1) (1.4) (3.6) (4.2)
Recognized net actuarial loss 43.5 38.7 132.5 116.9
Curtailment gain     (5.2) 0.0
Net periodic pension expense (benefit)/postretirement benefit expense 23.6 21.2 69.4 63.0
Pension Plans | U.S. Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0.0 0.0 0.0 0.0
Interest cost 52.8 57.7 158.5 173.4
Expected return on plan assets (58.8) (63.2) (176.4) (189.8)
Amortization of prior service benefit (0.6) (0.6) (1.9) (1.9)
Recognized net actuarial loss 31.6 29.0 94.8 87.0
Curtailment gain     0.0 0.0
Net periodic pension expense (benefit)/postretirement benefit expense 25.0 22.9 75.0 68.7
Pension Plans | International Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1.0 1.8 4.2 5.7
Interest cost 18.6 21.6 53.7 67.8
Expected return on plan assets (32.4) (34.0) (94.3) (106.8)
Amortization of prior service benefit (0.5) (0.8) (1.7) (2.3)
Recognized net actuarial loss 11.9 9.7 37.7 29.9
Curtailment gain     (5.2) 0.0
Net periodic pension expense (benefit)/postretirement benefit expense (1.4) (1.7) (5.6) (5.7)
Other Postretirement Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0.2 0.1 0.4 0.3
Interest cost 1.4 1.6 4.4 4.8
Expected return on plan assets (0.1) (0.1) (0.3) (0.3)
Amortization of prior service benefit (0.1) 0.0 (0.3) 0.0
Recognized net actuarial loss 0.3 0.3 0.9 0.9
Net periodic pension expense (benefit)/postretirement benefit expense $ 1.7 $ 1.9 $ 5.1 $ 5.7