Retirement Benefit Plans - Total Accumulated Benefit Obligations and Plans with Accumulated Benefit Obligations in Excess of Plan Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
U.S. and Puerto Rico [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Total accumulated benefit obligations	$ 392.0	$ 412.1
Plans with accumulated benefit obligations in excess of plan assets:
Accumulated benefit obligation	47.1	54.7
Plan assets at fair market value	41.6	45.2
Foreign [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Total accumulated benefit obligations	618.0	609.1
Plans with accumulated benefit obligations in excess of plan assets:
Accumulated benefit obligation	434.8	417.4
Plan assets at fair market value	$ 388.8	$ 375.5