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Age for eligible employee.

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Amount of annual incentive award payment participant can elect to defer.

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Installments in which restricted stock units vest and are converted to common stock.

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Number of anniversaries of grant date upon which restricted stock units vest.

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Stock option exercise price as percentage of market value.

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The period in which a stock option can be exercised.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Aggregate number of common shares reserved for future issuance.

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Unrecognized cost of unvested share-based compensation awards.

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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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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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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

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Stock-Based Compensation - Additional Information (Detail) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares Anniversaries Installment shares	Dec. 31, 2017 USD ($) $ / shares	Dec. 31, 2016 USD ($) $ / shares	May 08, 2014 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options exercise prices as percentage of the market value on the date of the grant	100.00%
Total intrinsic value of stock options exercised	$ 12.6	$ 4.5	$ 6.8
Total aggregate intrinsic value of stock options	16.8
Total aggregate intrinsic value of stock option exercisable	$ 14.3
Grant date fair value of stock options granted \| $ / shares	$ 15.07	$ 12.61	$ 9.12
Compensation expenses for stock options	$ 4.6	$ 8.2	$ 7.8
Omnibus Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation, common stock available for grant \| shares	5,900,000
Omnibus Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation, common stock available for grant \| shares				13,000,000
Inactive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance \| shares	1,900,000
Restricted Stock [Member] \| LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Portion of restricted stock award vesting on anniversary	0.333%
Eligible age of officer for restricted stock award	55 years
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period	3 years
Stock options term, years	10 years
Unrecognized compensation expense related to stock	$ 1.6
Weighted-average recognition period for unrecognized compensation expense related to stock (years)	1 year 8 months 12 days
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to stock	$ 46.7
Weighted-average recognition period for unrecognized compensation expense related to stock (years)	1 year 8 months 12 days
Number of anniversaries of grant date upon which restricted stock units vest \| Anniversaries	3
Installments in which restricted stock units vest and are converted to common stock \| Installment	3
Compensation expense	$ 54.3	38.0	33.9
Total fair value of shares, vested	$ 54.4	39.9	33.4
Restricted Stock Units [Member] \| AIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Eligible age of officer for restricted stock award	55 years
Amount of annual incentive award payment participant can elect to defer	50.00%
Additional common stock units for election of deferred annual incentive award, percentage	25.00%
Restricted Stock Awards and Units [Member] \| AIP and LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to stock	$ 1.6
Weighted-average recognition period for unrecognized compensation expense related to stock (years)	1 year 8 months 12 days
Compensation expense	$ 14.6	17.9	14.8
Total fair value of shares, vested	$ 14.7	$ 9.0	$ 5.2