Retirement Benefit Plans - Changes in Projected Benefit Obligations and Plan Assets (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
U.S. and Puerto Rico [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Projected benefit obligation - beginning of year	$ 420.7	$ 376.9
Service cost	8.0	8.7	$ 9.6
Interest cost	14.2	14.0	13.8
Benefits paid	(20.3)	(14.9)
Actuarial (gain) loss	(21.1)	36.9
Settlement	(5.5)	(0.9)
Projected benefit obligation - end of year	396.0	420.7	376.9
Foreign [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Projected benefit obligation - beginning of year	623.6	568.6
Service cost	20.0	17.7	19.0
Interest cost	8.1	8.4	10.0
Plan amendments	2.2	0.6
Employee contributions	18.1	17.0
Benefits paid	(36.9)	(34.5)
Actuarial (gain) loss	6.0	15.6
Expenses paid	(0.3)	(0.2)
Settlement		(0.8)
Translation (loss) gain	(9.7)	31.2
Projected benefit obligation - end of year	$ 631.1	$ 623.6	$ 568.6

Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of payment to participant of defined benefit plan which decreases benefit obligation. 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 increase benefit obligation.

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- Definition

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

+ References

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Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of increase (decrease) in benefit obligation of defined benefit plan from change in terms of existing plan or initiation of new plan.

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Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of (increase) decrease to benefit obligation of defined benefit plan from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Includes, but is not limited to, lump-sum cash payment to participant in exchange for right to receive specified benefits, purchase of nonparticipating annuity contract and change from remeasurement.

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- Definition

Defined benefit plan expenses paid.

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No definition available.

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

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