Retirement Benefit Plans - Total Accumulated Benefit Obligations and Plans with Accumulated 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]
Total accumulated benefit obligations	$ 364.8	$ 354.6
Plans with accumulated benefit obligations in excess of plan assets:
Accumulated benefit obligation	32.0	34.8
Plan assets at fair market value	21.8	20.6
Foreign-based Defined Benefit Plans [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Total accumulated benefit obligations	556.4	556.8
Plans with accumulated benefit obligations in excess of plan assets:
Accumulated benefit obligation	530.1	380.1
Plan assets at fair market value	$ 475.3	$ 314.9