Retirement Benefit Plans - Total Accumulated Benefit Obligations and Plans with Accumulated Benefit Obligations in Excess of Plan Assets (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]
Total accumulated benefit obligations	$ 337.5	$ 273.8
Plans with accumulated benefit obligations in excess of plan assets:
Accumulated benefit obligation	32.8	8.8
Plan assets at fair market value	22.0
Foreign-based Defined Benefit Plans [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Total accumulated benefit obligations	413.1	362.1
Plans with accumulated benefit obligations in excess of plan assets:
Accumulated benefit obligation	358.6	308.9
Plan assets at fair market value	$ 315.0	$ 303.7