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STOCK-BASED COMPENSATION - Stock Options (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 04, 2009 | Dec. 31, 2015 shares | Sep. 30, 2015 shares | Jun. 30, 2015 shares | Mar. 31, 2015 shares | Dec. 31, 2015 USD ($) item shares | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Stock-based compensation |  |  |  |  |  |  |  |
Stock-based compensation plans | item |  |  |  |  |  | 2 |  |
Compensation expense on share-based plans | $ |  |  |  |  |  | $ 32.7 | $ 28.6 | $ 28.8
Stock options |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |
Common stock granted, net of cancellations (in shares) |  | 6,000 | 56,000 | 33,000 | 903,000 |  |  |
Excess tax benefit realized for tax deductions from non-qualified stock option exercises and disqualifying dispositions of incentive stock options | $ |  |  |  |  |  | $ 314.7 | $ 11.9 | $ 30.3
2011 Omnibus Incentive Plan |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |
Aggregate amount of common stock authorized (in shares) |  | 14,500,000 |  |  |  | 14,500,000 |  |
Reduction in number of shares for each share granted |  | 2.16 |  |  |  | 2.16 |  |
Common stock granted, net of cancellations (in shares) |  |  |  |  |  | 4,595,021 |  |
Shares available for grant |  | 8,809,885 |  |  |  | 8,809,885 |  |
2011 Omnibus Incentive Plan | Stock options |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  | 5 years |  |
2011 Omnibus Incentive Plan | Stock options | Maximum |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |
Tenure of award |  |  |  |  |  | 10 years |  |
2009 Directors Plan |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |
Aggregate amount of common stock authorized (in shares) |  | 1,600,000 |  |  |  | 1,600,000 |  |
Percentage of award vesting on the last business day prior to the date of the annual meeting |  |  |  |  |  | 100.00% |  |
2009 Directors Plan | Minimum |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |
Percentage of closing price of the company's common stock on the date an option is granted to determine the exercise price |  |  |  |  |  | 100.00% |  |
2009 Directors Plan | Stock options, non-employee directors |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |
Common stock granted, net of cancellations (in shares) |  |  |  |  |  | 87,964 |  |
Shares available for grant |  | 1,512,036 |  |  |  | 1,512,036 |  |
The period during which awards can be granted, effective June 4, 2009 | 10 years |  |  |  |  |  |  |

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