Retirement Benefit Plan - Changes in Fair Value of Plan Assets (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
U.S. and Puerto Rico [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value - beginning of year	$ 433.6	$ 389.4
Actual return on plan assets	(25.7)	58.2
Employer contributions	6.4	1.8
Settlements	(5.5)	(0.9)
Benefits paid	(20.3)	(14.9)
Plan assets at fair market value - end of year	388.5	433.6
Funded status	(7.5)	12.9
Foreign [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value - beginning of year	574.9	507.0
Actual return on plan assets	7.5	42.7
Employer contributions	31.7	16.5
Employee contributions	18.1	17.0
Benefits paid	(36.9)	(34.5)
Expenses paid	(0.3)	(0.2)
Translation (loss) gain	(9.2)	26.4
Plan assets at fair market value - end of year	585.8	574.9
Funded status	$ (45.3)	$ (48.7)

Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses.

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Amount of administration expense of defined benefit plan which decreases plan assets. Excludes plan administration expense paid by employer.

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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- Definition

Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

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Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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Amount of contributions received by defined benefit plan from participant which increases plan assets.

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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) plan assets of defined benefit plan.

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Amount of payment, which decreases plan assets of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract.

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Pension Plans, Postretirement and Other Employee Benefits [Line Items]

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