Disposal Group, Including Discontinued Operations, Share-based Compensation Expense

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Expiry Period From Date Of Grant

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- Definition

Share Incentive Plans [Abstract]

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Conversion Rate Of Target

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- Definition

Spinoff Transaction, Equity Interests Issued Per Ordinary Predecessor Share

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

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- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Amount of tax benefit from exercise of stock options granted under share-based compensation arrangement.

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

Percentage of vesting of share-based compensation awards.

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Share Plans - Additional Information (Detail) - USD ($)		12 Months Ended
Share Plans - Additional Information (Detail) - USD ($)	May 09, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Sep. 28, 2012
Share-based compensation expense
Share-based compensation		$ 3,400,000	$ 7,600,000	$ 11,500,000
Share Incentive Plans
Vesting period		3 years
Fair value of options granted
Weighted average grant date fair value of options granted		$ 10.92	$ 12.59	$ 9.74
Total intrinsic value of options exercised		$ 18,200,000	$ 34,300,000	$ 27,100,000
Unrecognized compensation cost related to stock options		7,800,000
Cash received from option exercises		19,500,000	46,000,000	31,600,000
Tax benefit realized for tax deductions from option exercises		$ 5,600,000	7,800,000	5,500,000
Stock Options
Share Incentive Plans
Vesting period		3 years
Expiration period		10 years
Weighted average grant date fair value
Weighted average period to recognize compensation cost		2 years 1 month
Stock Options \| Tranche 1
Share Incentive Plans
Vesting percentage		33.33%
Stock Options \| Tranche 2
Share Incentive Plans
Vesting percentage		33.33%
Stock Options \| Tranche 3
Share Incentive Plans
Vesting percentage		33.33%
Restricted Stock and Restricted Stock Units (RSUs)
Share Incentive Plans
Vesting period		3 years
Restricted Stock and Restricted Stock Units (RSUs) \| Tranche 1
Share Incentive Plans
Vesting percentage		33.33%
Restricted Stock and Restricted Stock Units (RSUs) \| Tranche 2
Share Incentive Plans
Vesting percentage		33.33%
Restricted Stock and Restricted Stock Units (RSUs) \| Tranche 3
Share Incentive Plans
Vesting percentage		33.33%
Restricted Stock Units
Weighted average grant date fair value
Unrecognized compensation cost related to restricted stock units		$ 18,400,000
Weighted average period to recognize compensation cost		1 year
Total fair value of shares vested		$ 24,400,000	$ 21,700,000	$ 27,200,000
Tax benefit realized for tax deductions from option exercises		$ 700,000.0
Spin-off transaction, equity interests issued per ordinary predecessor share (in share)	1
Stock Appreciation Rights (SARs)
Share Incentive Plans
Vesting period		3 years
Performance Shares
Weighted average grant date fair value
Unrecognized compensation cost related to restricted stock units		$ 4,300,000
Weighted average period to recognize compensation cost		2 years 2 months
Tax benefit realized for tax deductions from option exercises		$ 200,000.0
Performance Shares \| Grant Date 2016
Weighted average grant date fair value
Conversion rate of target	125.00%
Performance Shares \| Grant Date 2017
Weighted average grant date fair value
Conversion rate of target	100.00%
2012 Stock and Incentive Plan
Share Incentive Plans
Number of shares authorized for issuance					9,000,000.0