Retirement Benefit Plan - Summary of Amounts Recognized in Other Comprehensive Income Income (Detail) $ in Millions	12 Months Ended
Dec. 31, 2016 USD ($)
U.S. and Puerto Rico [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Unrecognized prior service cost	$ (5.9)
Unrecognized actuarial loss	16.4
Total amount recognized	10.5
Foreign-based Defined Benefit Plans [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Unrecognized prior service cost	(4.2)
Unrecognized actuarial loss	3.8
Total amount recognized	$ (0.4)

Amount included in accumulated other comprehensive income (AOCI) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position, including gain (loss), prior service cost (credit), and transition asset (obligation).

No definition available.

Name:	us-gaap_DefinedBenefitPlanAmountToBeAmortizedFromAccumulatedOtherComprehensiveIncomeLossNextFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration