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Stock-Based Compensation - Schedule of RSU and PRSU Award Activity (Details)	9 Months Ended
	Sep. 30, 2015 $ / shares shares
Restricted Stock Units (RSUs)
RSUs and PRSUs, Nonvested, Number of Shares [Roll Forward]
Granted | shares	419,609
Vested | shares	(468,765)
Forfeitures | shares	(31,744)
RSUs and PRSUs, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted Average Grant Date Fair Value, Grants (per share)	$ 29.64
Weighted Average Grant Date Fair Value, Vested (per share)	21.28
Weighted Average Grant Date Fair Value, Forfeited (per share)	$ 25.41
Performance Restricted Stock Units (PRSUs)
RSUs and PRSUs, Nonvested, Number of Shares [Roll Forward]
Granted | shares	226,197
Vested | shares	(75,460)
Forfeitures | shares	(25,751)
RSUs and PRSUs, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted Average Grant Date Fair Value, Grants (per share)	$ 29.83
Weighted Average Grant Date Fair Value, Vested (per share)	28.61
Weighted Average Grant Date Fair Value, Forfeited (per share)	$ 26.42
Restricted stock units (“RSUs”) and performance-based RSUs (“PRSUs”)
RSUs and PRSUs, Nonvested, Number of Shares [Roll Forward]
Non-vested as of beginning of period | shares	1,278,602
Non-vested as of end of period | shares	1,322,688
RSUs and PRSUs, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted Average Grant Date Fair Value, Non-Vested, Beginning Balance (per share)	$ 21.92
Weighted Average Grant Date Fair Value, Non-Vested, Ending Balance (per share)	$ 26.46

X

- Definition

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

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 718



-SubTopic 10



-Section 50



-Paragraph 2



-Subparagraph (c)(1)(iv)(3)



-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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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-Publisher FASB



-Name Accounting Standards Codification



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+ References

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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).

+ References

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



-Publisher FASB



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+ References

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-Publisher FASB



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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ References

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



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+ References

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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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