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Retirement Benefit Plan - Summary of Amounts Recognized in AOCI (Detail)
$ in Millions
Dec. 31, 2019
USD ($)
U.S. and Puerto Rico [Member]  
Pension Plans, Postretirement and Other Employee Benefits [Line Items]  
Unrecognized prior service cost $ 0.3
Unrecognized actuarial loss 6.7
Total amount recognized 7.0
Foreign [Member]  
Pension Plans, Postretirement and Other Employee Benefits [Line Items]  
Unrecognized prior service cost (4.2)
Unrecognized actuarial loss 4.0
Total amount recognized $ (0.2)