Retirement Benefit Plans - Components of Net Pension Expense (Detail) (U.S. and Puerto Rico [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
U.S. and Puerto Rico [Member]
Schedule of Expected Future Pension Benefit Payment [Line Items]
Service cost	$ 7.1	$ 6.8
Interest cost	4.7	5.0
Expected return on plan assets	(8.9)	(8.3)
Amortization of prior service cost	(1.0)	(0.2)
Amortization of unrecognized actuarial loss	4.7	3.4
Net periodic pension expense	$ 6.6	$ 6.7