Retirement Benefit Plans - Plans with Benefit Obligations in Excess of Plan Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
U.S. and Puerto Rico [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Projected benefit obligation	$ 51.3	$ 53.8
Plan assets at fair market value	39.8	38.2
Foreign-based Defined Benefit Plans [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Projected benefit obligation	545.7	393.4
Plan assets at fair market value	$ 480.2	$ 319.6