Retirement Benefit Plans - Components of Net Pension Expense (Detail) - U.S. and Puerto Rico [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Schedule of Expected Future Pension Benefit Payment [Line Items]
Service cost	$ 6.4	$ 7.7	$ 13.9	$ 15.2
Interest cost	4.6	7.4	9.3	14.6
Expected return on plan assets	(10.1)	(12.7)	(20.2)	(25.4)
Curtailment gain	0.2	(0.3)	0.2	(0.6)
Amortization of prior service cost	(2.5)	(2.0)	(5.1)	(3.9)
Amortization of unrecognized actuarial loss	5.2	5.0	10.8	10.0
Net periodic pension expense	$ 3.8	$ 5.1	$ 8.9	$ 9.9