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CAPITAL STOCK - Additional Information - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019
Equity, Class of Treasury Stock [Line Items] |  |  |
Repurchase of shares of common stock |  | 1.7 | 0.5
Aggregate cost of repurchase | $ 0.2 |  |
Number of shares repurchased under settlement of employee tax withholding obligations |  |  | 0.2
Shares repurchased aggregate value under settlement of employee tax withholding obligations |  | $ 10.7 | $ 9.6
2006 Share Repurchase Program [Member] |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Share repurchase program | 1,000.0 | $ 1,000.0 |
Repurchase of shares of common stock |  | 1.4 |
Aggregate cost of repurchase |  | $ 61.9 | $ 28.7
2019 Share Repurchase Program [Member] |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Share repurchase program | $ 500.0 | 500.0 |
Share Repurchase Program [Member] |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Aggregate cost of repurchase |  | $ 73.2 |

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