Stock-Based Compensation - Additional Information (Detail) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2017 USD ($) $ / shares Anniversaries Installment	Dec. 31, 2016 USD ($) $ / shares	Dec. 31, 2015 USD ($) $ / 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	$ 4.5	$ 6.8	$ 0.1
Total aggregate intrinsic value of stock options	64.2
Total aggregate intrinsic value of stock option exercisable	$ 36.5
Grant date fair value of stock options granted \| $ / shares	$ 12.61	$ 9.12	$ 11.71
Compensation expenses for stock options	$ 8.2	$ 7.8	$ 7.4
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
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to stock	$ 34.9
Weighted-average recognition period for unrecognized compensation expense related to stock (years)	2 years 1 month 6 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	$ 38.0	33.9	34.8
Total fair value of shares, vested	$ 39.9	33.4	$ 35.8
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%
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	$ 2.2
Weighted-average recognition period for unrecognized compensation expense related to stock (years)	2 years
Restricted Stock And Restricted Stock Units [Member] \| AIP and LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to stock	$ 1.1
Weighted-average recognition period for unrecognized compensation expense related to stock (years)			1 year 8 months 12 days
Compensation expense	17.9	14.8	$ 3.4
Total fair value of shares, vested	$ 9.0	$ 5.2	$ 6.5

Additional common stock units for election of deferred annual incentive award, percentage.

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Age for eligible employee.

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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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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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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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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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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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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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