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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 0.7 $ 0.8 $ 2.1 $ 2.4
Interest cost 66.1 63.1 199.3 191.1
Expected return on plan assets (80.1) (85.7) (242.2) (259.9)
Amortization of prior service benefit (1.2) (1.5) (3.7) (4.7)
Recognized net actuarial loss 37.9 41.9 113.1 126.0
Net periodic pension expense (benefit)/postretirement benefit expense 23.4 18.6 68.6 54.9
Pension Plans | U.S. Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0.0 0.0 0.0 0.0
Interest cost 49.6 46.8 148.1 140.0
Expected return on plan assets (54.7) (57.7) (163.7) (172.9)
Amortization of prior service benefit (0.6) (0.6) (1.9) (1.9)
Recognized net actuarial loss 29.6 31.4 87.5 93.8
Net periodic pension expense (benefit)/postretirement benefit expense 23.9 19.9 70.0 59.0
Pension Plans | International Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0.7 0.8 2.1 2.4
Interest cost 16.5 16.3 51.2 51.1
Expected return on plan assets (25.4) (28.0) (78.5) (87.0)
Amortization of prior service benefit (0.6) (0.9) (1.8) (2.8)
Recognized net actuarial loss 8.3 10.5 25.6 32.2
Net periodic pension expense (benefit)/postretirement benefit expense (0.5) (1.3) (1.4) (4.1)
Postretirement Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0.1 0.2 0.3 0.5
Interest cost 1.2 1.1 3.6 3.5
Expected return on plan assets (0.1) (0.1) (0.3) (0.3)
Amortization of prior service benefit (0.4) (0.5) (1.2) (1.3)
Recognized net actuarial loss 0.2 0.4 0.5 0.9
Net periodic pension expense (benefit)/postretirement benefit expense $ 1.0 $ 1.1 $ 2.9 $ 3.3