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Employee Benefit and Retirement Plans - Schedule of Company's Pension Cost And Supplemental Retirement Plans (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Pension Plan | U.S.        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 0.2 $ 0.2 $ 0.3 $ 0.4
Interest cost 12.2 11.6 24.5 23.2
Expected return on plan assets (14.8) (16.8) (29.6) (33.7)
Amortization, net 3.9 5.3 7.7 10.7
Net periodic expense 1.5 0.3 2.9 0.6
Pension Plan | International        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1.4 1.3 2.9 2.7
Interest cost 3.1 3.1 6.3 6.4
Expected return on plan assets (3.2) (3.9) (6.5) (7.9)
Amortization, net 0.6 0.7 1.2 1.3
Net periodic expense 1.9 1.2 3.9 2.5
Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0.1 0.0 0.1 0.1
Interest cost 0.4 0.4 0.9 0.9
Amortization, net (2.3) (2.5) (4.7) (5.1)
Net periodic expense $ (1.8) $ (2.1) $ (3.7) $ (4.1)