Retirement Benefit Plan - Summary of Amounts Recognized in Balance Sheet (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
U.S. and Puerto Rico [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Prepaid pension	$ 29.4	$ 92.7
Short-term accrued benefit liability	(0.7)	(0.7)
Long-term accrued benefit liability	(13.1)	(10.1)
Net amount recognized	15.6	81.9
Foreign-based Defined Benefit Plans [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Prepaid pension	12.4	12.1
Short-term accrued benefit liability	(0.5)
Long-term accrued benefit liability	(50.2)	(11.3)
Net amount recognized	$ (38.3)	$ 0.8