Retirement Benefit Plans - Components of Net Pension Expense (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
U.S. and Puerto Rico [Member]
Schedule of Expected Future Pension Benefit Payment [Line Items]
Service cost	$ 8.0	$ 8.7	$ 9.6
Interest cost	14.2	14.0	13.8
Expected return on plan assets	(32.9)	(32.4)	(32.2)
Settlements	1.2	0.4	2.6
Amortization of prior service cost	(5.7)	(5.9)	(5.9)
Amortization of unrecognized actuarial loss	23.7	17.9	16.5
Net periodic benefit cost	8.5	2.7	4.4
Foreign [Member]
Schedule of Expected Future Pension Benefit Payment [Line Items]
Service cost	20.0	17.7	19.0
Interest cost	8.1	8.4	10.0
Expected return on plan assets	(14.0)	(12.2)	(13.7)
Curtailment gain			(0.5)
Settlements	0.2	1.1
Amortization of prior service cost	(4.2)	(4.4)	(1.9)
Amortization of unrecognized actuarial loss	2.5	4.2	6.4
Net periodic benefit cost	$ 12.6	$ 14.8	$ 19.3