CAPITAL STOCK - Additional Information (Detail) - USD ($) shares in Millions, $ in Millions	9 Months Ended		116 Months Ended	119 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Jun. 30, 2016	Sep. 30, 2016
Equity, Class of Treasury Stock [Line Items]
Share repurchase program	$ 1,000.0			$ 1,000.0
Repurchase of shares of common stock	1.9	2.0
Aggregate cost of repurchase	$ 66.6	$ 80.0
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	$ 7.8	$ 3.9
Treasury Stock, Shares, Retired	15.0
2006 Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Repurchase of shares of common stock				20.3
Aggregate cost of repurchase			$ 825.9