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CAPITAL STOCK - Additional Information (Detail) - USD ($) shares in Millions, $ in Millions | 6 Months Ended | 140 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018
Equity, Class of Treasury Stock [Line Items] |  |  |
Number of shares repurchased under settlement of employee tax withholding obligations | 0.1 | 0.1 |
Shares repurchased aggregate value under settlement of employee tax withholding obligations | $ 5.4 | $ 2.8 |
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 | 1.0 | 0.8 | 22.1
Aggregate cost of repurchase | $ 50.0 | $ 30.0 | $ 909.4

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