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STOCK-BASED COMPENSATION - Narrative (Details) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2013 shares | Dec. 31, 2018 USD ($) plan shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of share-based award plans | plan |  | 1 |  |
Increase in reserve under share-based award plan, number of shares (in shares) | shares | 11,000,000 |  |  |
Total income tax benefit recognized for stock-based compensation expense |  | $ 9.7 | $ 13.7 | $ 13.3
Cash provided by operating activities |  | 672.2 | 816.0 | 823.0
Excess tax benefits from stock-based compensation plans, operating activities |  | 0.0 | 0.0 | (35.9)
Excess tax benefits from stock-based compensation plans, financing activities |  | $ 0.0 | 0.0 | 35.9
Stock options vesting percentage for each year of completed service |  | 33.00% |  |
Stock options expiration periods |  | 10 years |  |
Minimum percentage of target to which shares may be issued |  | 0.00% |  |
Maximum percentage of target to which shares may be issued |  | 200.00% |  |
Percentage of target that shares may be issued |  | 100.00% |  |
Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based payment award options nonvested number of shares | shares |  | 283,003 |  |
Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based payment award options nonvested number of shares | shares |  | 566,006 |  |
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total intrinsic value of stock options exercised |  | $ 13.3 | 31.4 | 64.8
Total unrecognized compensation cost |  | $ 8.2 |  |
Total unrecognized compensation cost, weighted-average period of recognition |  | 1 year 7 months |  |
Stock Options | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock awards vesting periods (up to) |  | 3 years |  |
Nonvested Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total unrecognized compensation cost |  | $ 51.6 |  |
Total unrecognized compensation cost, weighted-average period of recognition |  | 2 years 1 month |  |
Total weighted-average fair value of nonvested stock vested, based on the vesting date |  | $ 50.2 | 79.4 | 71.7
Total weighted-average fair value of nonvested stock vested, based on the grant date |  | $ 40.4 | 45.0 | 38.8
Nonvested Stock | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock awards vesting periods (up to) |  | 1 year |  |
Nonvested Stock | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock awards vesting periods (up to) |  | 3 years |  |
Accounting Standards Update 2016-09 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Cash provided by operating activities |  | $ 7.5 | $ 26.7 |
Excess tax benefits from stock-based compensation plans, operating activities |  |  |  | 35.9
Excess tax benefits from stock-based compensation plans, financing activities |  |  |  | $ 35.9

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