Represents the percentage of PRSUs vesting on the second anniversary of the grant date.

No definition available.

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- Definition

Represents the percentage of PRSUs vesting on the third anniversary of the grant date.

+ References

No definition available.

+ Details

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- Definition

Represents the aggregate intrinsic 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, as calculated by applying the disclosed pricing methodology.

+ References

No definition available.

+ Details

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- Definition

Represents the percentage multiplied to target award for determining the number of shares subject to award.

+ References

No definition available.

+ Details

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- Definition

As of the balance sheet date, the total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of fully vested and expected to vest equity-based awards other than stock (or unit) option plans.

+ References

No definition available.

+ Details

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- Definition

As of the balance sheet date, the number of shares under equity-based payment instruments, excluding stock (or unit) options that are vested or expected to vest.

+ References

No definition available.

+ Details

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- Definition

As of the balance sheet date, the weighted-average grant date fair value for outstanding equity-based awards other than stock (or unit) option plans that are fully vested or expected to vest.

+ References

No definition available.

+ Details

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- Definition

The weighted average period between the balance sheet date and expiration date for fully vested and expected to vest equity-based awards other than stock (or unit) option plans.

+ References

No definition available.

+ Details

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- Definition

As of the balance sheet date, the total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of equity-based awards other than stock (or unit) option plans that vested during the period.

+ References

No definition available.

+ Details

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- Definition

Represents the number of installments that the award will vest.

+ References

No definition available.

+ Details

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- Definition

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.

+ 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 (a)(1)

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

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- 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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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

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.

+ 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)(2)(iii)(3)

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

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- Definition

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).

+ 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)(2)(iii)(1)

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

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- Definition

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

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(1)

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

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ 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)(2)(i)-(ii)

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

+ Details

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Data Type:	xbrli:sharesItemType
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- Definition

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(i)-(ii)

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

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Data Type:	num:perShareItemType
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- Definition

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.

+ 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 (e)(1)

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

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested 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)(2)(iii)(2)

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

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Data Type:	xbrli:sharesItemType
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- Definition

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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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)(2)(iii)(2)

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

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ 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 (f)(2)(iii)

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

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- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.D.2)

-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (f)(2)(i)

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section D

-Subsection 2

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the 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 (f)(2)(ii)

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

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (f)(2)(iv)

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

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- Definition

For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

+ References

No definition available.

+ Details

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SHARE-BASED COMPENSATION (Details 4) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	12 Months Ended			1 Months Ended
	May 31, 2014 installment	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	May 31, 2012	May 31, 2013 installment
Aggregate Intrinsic Value
Number of installments that PRSUs will vest in	3axll_VestingNumberOfInstallments
Positive adjusted EBITDA for prescribed performance period
Aggregate Intrinsic Value
Number of installments that PRSUs will vest in	3
Restricted and deferred stock units
Shares
Outstanding at the beginning of the period (in shares)		1,009,303
Granted (in shares)		447,608	450,169	409,351
Vested and released (in shares)		(421,347)
Forfeited (in shares)		(62,721)
Outstanding at the end of the period (in shares)		972,843	1,009,303
Vested or expected to vest at the end of the period (in shares)		927,467
Weighted Average Remaining Contractual Terms
Outstanding at the end of the period		1 year 1 month 6 days
Vested or expected to vest at the end of the period		1 year 1 month 6 days
Weighted Average Grant Date Fair Value
Outstanding at the beginning of the period (in dollars per share)		$ 35.68
Granted (in dollars per share)		$ 44.38	$ 45.20	$ 30.18
Vested and released (in dollars per share)		$ 32.32
Forfeited (in dollars per share)		$ 41.64
Outstanding at the end of the period (in dollars per share)		$ 41.30	$ 35.68
Vested or expected to vest at the end of the period (in dollars per share)		$ 41.21
Aggregate Intrinsic Value
Outstanding at the end of the period (in dollars)		$ 40.2
Vested or expected to vest at the end of the period (in dollars)		39.4
Total intrinsic value of share awards vested (in dollars)		$ 19.5	$ 6.1	$ 15.8
Restricted stock surrendered in satisfaction of required minimum tax withholding obligations (in shares)		163,404	36,846	152,759
Restricted and deferred stock units \| Minimum
Aggregate Intrinsic Value
Vesting period		1 year
Restricted and deferred stock units \| Maximum
Aggregate Intrinsic Value
Vesting period		3 years
PRSUs
Weighted average assumptions used in the Monte Carlo simulation model
Risk-free interest rate (as a percent)		0.79%		0.44%
Expected life		3 years		3 years
Expected volatility (as a percent)		43.00%		45.00%
Expected dividend yield (as a percent)		1.07%		1.07%
PRSUs \| Stock price performance measured against specified performance targets \| Minimum
Aggregate Intrinsic Value
Percentage multiplied to target award for determining the number of shares subject to award					0.00%
PRSUs \| Stock price performance measured against specified performance targets \| Maximum
Aggregate Intrinsic Value
Percentage multiplied to target award for determining the number of shares subject to award					150.00%
PRSUs \| Contingent on achievement of certain synergies relating to the Merger
Aggregate Intrinsic Value
Percentage of PRSUs vesting on second anniversary						50.00%
Percentage of PRSUs vesting on third anniversary						50.00%
Number of installments that PRSUs will vest in						3
PRSUs \| Contingent on achievement of certain synergies relating to the Merger \| Minimum
Aggregate Intrinsic Value
Percentage multiplied to target award for determining the number of shares subject to award						0.00%
PRSUs \| Contingent on achievement of certain synergies relating to the Merger \| Maximum
Aggregate Intrinsic Value
Percentage multiplied to target award for determining the number of shares subject to award						200.00%
PRSUs \| Company relative total shareholder return as compared to peer companies
Aggregate Intrinsic Value
Percentage of PRSUs vesting on third anniversary	100.00%
PRSUs \| Company relative total shareholder return as compared to peer companies \| Minimum
Aggregate Intrinsic Value
Percentage multiplied to target award for determining the number of shares subject to award	0.00%
PRSUs \| Company relative total shareholder return as compared to peer companies \| Maximum
Aggregate Intrinsic Value
Percentage multiplied to target award for determining the number of shares subject to award	200.00%