Employee Benefit and Retirement Plans - Schedule of Company's Pension Cost And Supplemental Retirement Plans (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Pension Benefits [Member] | United States Pension Plan of US Entity [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Service cost	$ 2.8	$ 2.7	$ 3.2
Interest cost	50.5	45.1	41.3
Expected return on plan assets	(73.3)	(69.1)	(58.0)
Prior service cost (credit)	(0.1)	(0.1)	(0.1)
Net actuarial gain (loss)	23.7	21.8	26.2
Curtailment, settlement and termination (benefit) costs	(3.7)		52.1
Total expense (income)	(0.1)	0.4	64.7
Pension Benefits [Member] | International [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Service cost	7.5	6.6	5.8
Interest cost	13.6	17.5	19.6
Expected return on plan assets	(18.7)	(20.8)	(22.1)
Prior service cost (credit)	0.4	0.5
Net actuarial gain (loss)	2.2	2.2	3.4
Curtailment, settlement and termination (benefit) costs	1.3	2.9	0.4
Total expense (income)	6.2	8.9	7.1
Postretirement Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Service cost	0.1	0.1	0.3
Interest cost	2.2	2.2	3.4
Prior service cost (credit)	(5.2)	(5.2)	(6.6)
Net actuarial gain (loss)	(3.9)	(5.2)	(1.2)
Total expense (income)	$ (6.8)	$ (8.1)	$ (4.1)