Employee Benefit and Retirement Plans - Schedule of Company's Pension Cost And Supplemental Retirement Plans (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Pension Benefits [Member] | United States Pension Plan of US Entity [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0.2	$ 0.7
Interest cost	11.8	12.6
Expected return on plan assets	(16.9)	(18.3)
Amortization, net	5.4	5.9
Net periodic pension cost	0.5	0.9
Pension Benefits [Member] | International [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1.6	1.8
Interest cost	3.4	3.3
Expected return on plan assets	(4.0)	(4.5)
Amortization, net	0.7	0.6
Curtailment, settlement and termination (benefit) costs	0.3
Net periodic pension cost	2.0	1.2
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.1
Interest cost	0.5	0.6
Amortization, net	(2.6)	(2.3)
Net periodic pension cost	$ (2.0)	$ (1.7)