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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 0.8 $ 1.0 $ 2.4 $ 4.2
Interest cost 63.1 71.4 191.1 212.2
Expected return on plan assets (85.7) (91.2) (259.9) (270.7)
Amortization of prior service benefit (1.5) (1.1) (4.7) (3.6)
Recognized net actuarial loss 41.9 43.5 126.0 132.5
Curtailment gain     0.0 (5.2)
Net periodic pension expense (benefit)/postretirement benefit expense 18.6 23.6 54.9 69.4
Pension Plans | U.S. Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0.0 0.0 0.0 0.0
Interest cost 46.8 52.8 140.0 158.5
Expected return on plan assets (57.7) (58.8) (172.9) (176.4)
Amortization of prior service benefit (0.6) (0.6) (1.9) (1.9)
Recognized net actuarial loss 31.4 31.6 93.8 94.8
Curtailment gain     0.0 0.0
Net periodic pension expense (benefit)/postretirement benefit expense 19.9 25.0 59.0 75.0
Pension Plans | International Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0.8 1.0 2.4 4.2
Interest cost 16.3 18.6 51.1 53.7
Expected return on plan assets (28.0) (32.4) (87.0) (94.3)
Amortization of prior service benefit (0.9) (0.5) (2.8) (1.7)
Recognized net actuarial loss 10.5 11.9 32.2 37.7
Curtailment gain     0.0 (5.2)
Net periodic pension expense (benefit)/postretirement benefit expense (1.3) (1.4) (4.1) (5.6)
Postretirement Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0.2 0.2 0.5 0.4
Interest cost 1.1 1.4 3.5 4.4
Expected return on plan assets (0.1) (0.1) (0.3) (0.3)
Amortization of prior service benefit (0.5) (0.1) (1.3) (0.3)
Recognized net actuarial loss 0.4 0.3 0.9 0.9
Net periodic pension expense (benefit)/postretirement benefit expense $ 1.1 $ 1.7 $ 3.3 $ 5.1