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STOCK-BASED COMPENSATION (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 1 Months Ended | 3 Months Ended
--- | --- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2013 Restricted Stock Units | Mar. 31, 2013 Performance Share Awards item | Mar. 31, 2013 Performance Share Awards Greater than | Mar. 31, 2013 Performance Share Awards Less than or equal to | Mar. 31, 2013 Performance shares based on performance conditions | Mar. 31, 2013 Performance Share Awards Based on Internal Performance Metrics -3 Year Graded Vesting | Mar. 31, 2013 Performance Share Awards Based on Internal Metrics-Three Performance Metrics item | Feb. 28, 2013 Performance shares based on market conditions | Mar. 31, 2013 Performance shares based on market conditions item
Stock-Based Compensation arrangements |  |  |  |  |  |  |  |  |  |  |
Stock based compensation expense | $ 18.7 | $ 1.7 |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  | 402,250 |  |  | 274,760 | 84,990 | 189,770 |  | 127,490
Granted and fully vested (in shares) |  |  | 22,560 |  |  |  |  |  |  |  |
Granted (in dollars per share) |  |  | $ 53.23 |  |  |  | $ 53.23 |  |  | $ 46.12 |
Annual forfeiture rate assumption (as a percent) |  |  |  |  | 0.00% | 6.00% |  |  |  |  |
Number of types of performance awards granted to employees |  |  |  | 3 |  |  |  |  |  |  |
Right to receive shares as percentage of award |  |  |  |  |  |  | 100.00% |  |  |  |
Number of years over which performance criteria is to be met |  |  |  | 3 years |  |  |  |  |  |  |
Minimum operating cash flow for the year preceding the performance period |  |  |  |  |  |  |  | $ 100 |  |  |
Number of criteria considered for awarding performance shares |  |  |  |  |  |  |  |  | 3 |  |
Vesting rights |  |  |  |  |  |  |  | 25% of the shares vest on each the first and second anniversary dates following the date of grant and 50% of the shares vest on the third anniversary following the date of the grant | An employee will earn one-third of the award granted for each internal performance metric that the Company meets at the end of the performance period. |  |
Number of other companies in the Company's peer group |  |  |  |  |  |  |  |  |  |  | 16
Assumptions: |  |  |  |  |  |  |  |  |  |  |
Value per Share, low end of range (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 40.86
Value per Share, high end of range (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 67.51
Stock price volatility (as a percent) |  |  |  |  |  |  |  |  |  | 43.80% |
Risk free rate of return (as a percent) |  |  |  |  |  |  |  |  |  | 0.40% |
Expected dividend yield (as a percent) |  |  |  |  |  |  |  |  |  | 0.20% | 0.10%
Stock Price Volatility, low end of range (as a percent) |  |  |  |  |  |  |  |  |  |  | 33.00%
Stock Price Volatility, high end of range (as a percent) |  |  |  |  |  |  |  |  |  |  | 46.10%
Risk free rate of return, low end of range (as a percent) |  |  |  |  |  |  |  |  |  |  | 0.10%
Risk free rate of return, high end of range (as a percent) |  |  |  |  |  |  |  |  |  |  | 0.30%

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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(c) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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