CAPITAL STOCK - Additional Information (Detail) - USD ($) shares in Millions, $ in Millions	9 Months Ended		107 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015
Equity, Class of Treasury Stock [Line Items]
Share repurchase program	$ 1,000.0		$ 1,000.0
Repurchase of shares of common stock	2.0	0.4
Aggregate cost of repurchase	$ 80.0	$ 20.0
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	$ 3.9	$ 5.5
2006 Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Repurchase of shares of common stock			18.4
Aggregate cost of repurchase			$ 759.3