Employee Benefit and Retirement Plans - Schedule of Company's Pension Cost And Supplemental Retirement Plans (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Pension Benefits [Member] | United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0.8	$ 2.8	$ 2.7
Interest cost	46.4	49.6	44.4
Expected return on plan assets	(67.5)	(73.3)	(69.1)
Prior service cost (credit)	(0.1)	(0.1)	(0.1)
Net actuarial gain (loss)	21.4	23.7	21.8
Curtailment, settlement and termination (benefit) costs		(3.7)
Total expense (income)	1.0	(1.0)	(0.3)
Pension Benefits [Member] | International [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	5.3	6.4	6.0
Interest cost	13.0	13.2	17.2
Expected return on plan assets	(14.7)	(18.2)	(20.3)
Prior service cost (credit)	0.4	0.4	0.5
Net actuarial gain (loss)	2.0	2.0	2.4
Curtailment, settlement and termination (benefit) costs	1.3	1.3	2.9
Total expense (income)	7.3	5.1	8.7
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.3	0.1	0.1
Interest cost	1.8	2.2	2.2
Prior service cost (credit)	(6.6)	(5.2)	(5.2)
Net actuarial gain (loss)	(3.6)	(3.9)	(5.2)
Total expense (income)	$ (8.1)	$ (6.8)	$ (8.1)