Retirement Benefit Plans - Components of Net Pension Expense (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
U.S. and Puerto Rico [Member]
Schedule of Expected Future Pension Benefit Payment [Line Items]
Service cost	$ 8.7	$ 9.6	$ 11.8
Interest cost	14.0	13.8	15.8
Expected return on plan assets	(32.4)	(32.2)	(31.8)
Settlements	0.4	2.6
Amortization of prior service cost	(5.9)	(5.9)	(3.7)
Amortization of unrecognized actuarial loss	17.9	16.5	17.4
Net periodic benefit cost	2.7	4.4	9.5
Foreign-based Defined Benefit Plans [Member]
Schedule of Expected Future Pension Benefit Payment [Line Items]
Service cost	17.7	19.0	18.9
Interest cost	8.4	10.0	8.8
Expected return on plan assets	(12.2)	(13.7)	(13.9)
Curtailment gain		0.5
Settlements	1.1
Amortization of prior service cost	(4.4)	(1.9)	(1.9)
Amortization of unrecognized actuarial loss	4.2	6.4	2.7
Net periodic benefit cost	$ 14.8	$ 19.3	$ 14.6