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CAPITAL STOCK - Additional Information (Detail) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended | 116 Months Ended
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016
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 |  | 0.6 | 2.0 |
Aggregate cost of repurchase |  | $ 20.0 | $ 80.0 |
Treasury Stock, Shares, Retired | 15.0 |  |  |
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 |  | $ 7.5 | $ 3.7 |
2006 Share Repurchase Program [Member] |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Repurchase of shares of common stock |  |  |  | 19.0
Aggregate cost of repurchase |  |  |  | $ 779.3

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