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CAPITAL STOCK - Additional Information (Detail) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended | 155 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Oct. 30, 2019
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate cost of repurchase | $ 18.3 | $ 0.1 | $ 19.9 | $ 0.4 | $ 0.1 | $ 55.3 |  |  |  |
Number of shares repurchased under settlement of employee tax withholding obligations |  |  |  |  |  |  | 0.2 | 0.1 |  |
Shares repurchased aggregate value under settlement of employee tax withholding obligations |  |  |  |  |  |  | $ 9.6 | $ 5.8 |  |
2006 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Share repurchase program | $ 1,000.0 |  |  |  |  |  | $ 1,000.0 |  | $ 1,000.0 |
Repurchase of shares of common stock |  |  |  |  |  |  | 0.5 | 1.0 | 22.7 |
Aggregate cost of repurchase |  |  |  |  |  |  | $ 28.7 | $ 50.0 | $ 938.1 |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Repurchase Authorization to Close Out 2006 Repurchase Program |  |  |  |  |  |  |  |  |  | $ 40.0
Subsequent Event [Member] | 2019 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Share repurchase program |  |  |  |  |  |  |  |  |  | $ 500.0

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