Stock-Based Compensation - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2013 Anniversaries	Dec. 31, 2012	Dec. 31, 2011
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 options exercised		$ 4.3	$ 7.6
Total aggregate intrinsic value of options	27.0
Total aggregate intrinsic value of option exercisable	13.8
Grant date fair value of options granted	$ 15.03	$ 11.40	$ 15.37
Compensation expenses for stock options	8.6	9.9	9.9
Number of anniversaries of grant date upon which restricted stock units vest	3
AIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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%
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 LTIP restricted stock award	55
RSU [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Installments in which restricted stock units vest and are converted to common stock	3
Compensation expense	32.6	34.2	31.6
Total fair value of shares, vested	34.1	33.1	29.3
Unrecognized compensation expense related to stock	29.4
Weighted-average recognition period for unrecognized compensation expense related to stock (years)	2 years
AIP and LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	6.3	6.6	7.4
Total fair value of shares, vested	5.7	6.0	7.3
Unrecognized compensation expense related to stock	$ 0.6
Weighted-average recognition period for unrecognized compensation expense related to stock (years)	1 year 8 months 12 days
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

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

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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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Fraction of restricted stock award vesting on anniversary.

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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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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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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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- Definition

The total fair value of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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 total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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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 of difference between fair value of the underlying shares reserved for issuance and exercise price of options outstanding.

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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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