PREFERRED STOCK - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Feb. 28, 2018	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Equity [Abstract]
Preferred stock, authorized (in shares)		1,000,000		1,000,000
Preferred stock, issued (in shares)		658,190		700,000
Preferred stock, outstanding (in shares)		658,190		700,000
Dividends paid on mandatory convertible preferred stock		$ 8.8	$ 9.4
Increase to retained earnings on repurchase of mandatory convertible preferred stock		$ 7.3	$ 4.6
Depositary shares repurchased during period (in shares)	151,900	151,900
Depository shares equivalent to preferred stock units (in shares)		15,190