CAPITAL STOCK - Additional Information (Detail) - USD ($) shares in Millions, $ in Millions	6 Months Ended		101 Months Ended	104 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Mar. 31, 2015	Jun. 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	0.2
Aggregate cost of repurchase	$ 80.0	$ 10.0
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	$ 3.7	$ 4.9
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