Employee Benefit and Retirement Plans - Schedule of Company's Pension Cost And Supplemental Retirement Plans (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Pension Plan | U.S.
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0.1	$ 0.2	$ 0.4	$ 0.6
Interest cost	12.3	11.6	36.8	34.8
Expected return on plan assets	(14.8)	(16.9)	(44.4)	(50.6)
Amortization, net	3.9	5.4	11.6	16.1
Net periodic expense	1.5	0.3	4.4	0.9
Pension Plan | International
Defined Benefit Plan Disclosure [Line Items]
Service cost	1.4	1.3	4.3	4.0
Interest cost	3.0	3.1	9.3	9.5
Expected return on plan assets	(3.0)	(3.6)	(9.5)	(11.5)
Amortization, net	0.5	0.5	1.7	1.8
Net periodic expense	1.9	1.3	5.8	3.8
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.0	0.1	0.1	0.2
Interest cost	0.5	0.5	1.4	1.4
Amortization, net	(2.3)	(2.6)	(7.0)	(7.7)
Net periodic expense	$ (1.8)	$ (2.0)	$ (5.5)	$ (6.1)