CAPITAL STOCK - Additional Information (Detail) - USD ($) shares in Millions, $ in Millions	3 Months Ended						9 Months Ended		155 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Oct. 30, 2019
Equity, Class of Treasury Stock [Line Items]
Aggregate cost of repurchase	$ 18.3	$ 0.1	$ 19.9	$ 0.4	$ 0.1	$ 55.3
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							$ 9.6	$ 5.8
2006 Share Repurchase Program [Member]
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							0.5	1.0	22.7
Aggregate cost of repurchase							$ 28.7	$ 50.0	$ 938.1
Subsequent Event [Member]
Equity, Class of Treasury Stock [Line Items]
Repurchase Authorization to Close Out 2006 Repurchase Program										$ 40.0
Subsequent Event [Member] | 2019 Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Share repurchase program										$ 500.0