Employee Benefit and Retirement Plans - Schedule of Company's Pension Cost And Supplemental Retirement Plans (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Pension Benefits [Member] | United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0.1	$ 0.2
Interest cost	12.3	11.6
Expected return on plan assets	(14.8)	(16.9)
Amortization, net	3.8	5.4
Net periodic expense	1.4	0.3
Pension Benefits [Member] | International [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1.5	1.4
Interest cost	3.2	3.3
Expected return on plan assets	(3.3)	(4.0)
Amortization, net	0.6	0.6
Net periodic expense	2.0	1.3
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		0.1
Interest cost	0.5	0.5
Amortization, net	(2.4)	(2.6)
Net periodic expense	$ (1.9)	$ (2.0)