v2.4.0.6

Stock-Based Compensation (Details 1) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Restricted stock unit and restricted stock activity
Number of Restricted Stock Units and Shares of Restricted Stock, Other stock awards, beginning balance (in shares)	905,300
Number of Restricted Stock Units and Shares of Restricted Stock, Granted (in shares)	312,700
Number of Restricted Stock Units and Shares of Restricted Stock, Vested and issued (in shares)	(59,700)
Number of Restricted Stock Units and Shares of Restricted Stock, Forfeited (in shares)	0
Number of Restricted Stock Units and Shares of Restricted Stock, Other stock awards, ending balance (in shares)	1,158,300
Number of Restricted Stock Units and Shares of Restricted Stock, Vested and unissued (in shares)	741,100
Weighted Average Grant Date Fair Value per Share, Other stock awards, beginning balance (in dollars per share)	$ 27.51
Weighted Average Grant Date Fair Value per Share, Granted (in dollars per share)	$ 30.33
Weighted Average Grant Date Fair Value per Share, Vested and Issued (in dollars per share)	$ 27.14
Weighted Average Grant Date Fair Value per Share, Forfeited (in dollars per share)	$ 0.00
Weighted Average Grant Date Fair Value per Share, Other stock awards, ending balance (in dollars per share)	$ 28.30
Weighted Average Grant Date Fair Value per Share, Vested and Unissued (in dollars per share)	$ 21.81
Weighted Average Remaining Contractual Term (years), Other stock awards	9 months 18 days
Aggregate Intrinsic Value, Other stock awards	$ 38.2

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made 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 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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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan 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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