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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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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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- Definition

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

+ References

No definition available.

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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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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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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Stock-Based Compensation - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Nov. 09, 2009
Compensation Related Costs Disclosure [Line Items]
Shares of common stock reserved for issuance under the 2009 Long-Term Stock Incentive Plan				11,815,748
Compensation expense	$ 58.4	$ 38.9	$ 33.6
Unrecognized compensation expense	$ 54.5
Unrecognized compensation expense, period of recognition	1 year 6 months
Performance Shares
Compensation Related Costs Disclosure [Line Items]
Vesting period	3 years
Weighted average grant date fair value of performance shares granted	$ 51.03	$ 45.21	$ 55.15
Restricted stock units
Compensation Related Costs Disclosure [Line Items]
Weighted average grant date fair value of performance shares granted	$ 56.69	$ 43.23	$ 54.88