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STOCK-BASED COMPENSATION (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended | 0 Months Ended | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 Restricted Stock Awards | Jun. 30, 2013 Restricted Stock Units | Jun. 30, 2013 Performance Share Awards item | Jun. 30, 2013 Performance Share Awards Greater than | Jun. 30, 2013 Performance Share Awards Less than or equal to | Jun. 30, 2013 Performance shares based on performance conditions | Jun. 30, 2013 Performance Share Awards Based on Internal Performance Metrics -3 Year Graded Vesting | Jun. 30, 2013 Performance Share Awards Based on Internal Metrics-Three Performance Metrics item | Feb. 21, 2013 Performance shares based on market conditions | Jun. 30, 2013 Performance shares based on market conditions item
Stock-Based Compensation arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock based compensation expense | $ 10.0 | $ 11.4 | $ 28.7 | $ 13.1 |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 2,050 |  | 402,250 |  |  | 274,760 | 84,990 | 189,770 |  | 127,490
Granted and fully vested (in shares) |  |  |  |  |  | 23,576 |  |  |  |  |  |  |  |
Granted (in dollars per share) |  |  |  |  | $ 68.87 | $ 53.75 |  |  |  | $ 53.23 |  |  | $ 46.12 |
Annual forfeiture rate assumption (as a percent) |  |  |  |  | 6.00% |  |  | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  | 15
Assumptions: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value per Share, low end of range (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 46.09
Value per Share, high end of range (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 70.96
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) |  |  |  |  |  |  |  |  |  |  |  |  |  | 31.60%
Stock Price Volatility, high end of range (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 43.10%
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) |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.50%

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- Definition 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 -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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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 + Details
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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 + Details
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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 + Details
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- Definition 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 + Details
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- Definition The estimated measure of the maximum 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 No definition available. + Details
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- Definition The estimated measure of the minimum 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 No definition available. + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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