Retirement Benefit Plans - Total Accumulated Benefit Obligations and Plans with Accumulated Benefit Obligations in Excess of Plan Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
U.S. and Puerto Rico [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Total accumulated benefit obligations	$ 472.0	$ 392.0
Plans with accumulated benefit obligations in excess of plan assets:
Accumulated benefit obligation	472.0	47.1
Plan assets at fair market value	444.9	41.6
Foreign [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Total accumulated benefit obligations	721.5	618.0
Plans with accumulated benefit obligations in excess of plan assets:
Accumulated benefit obligation	674.0	434.8
Plan assets at fair market value	$ 612.9	$ 388.8