EARNINGS PER SHARE - (Narrative) (Details) $ / shares in Units, $ in Millions		3 Months Ended	12 Months Ended
	Feb. 23, 2018 USD ($) $ / shares shares	Dec. 31, 2019 transaction $ / shares	Dec. 31, 2019 USD ($) transaction $ / shares shares	Dec. 31, 2018 $ / shares
Earnings Per Share [Abstract]
Treasury stock activity (in shares) | shares	475,920		496,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01	$ 0.01
Number of transactions with unaffiliated entity | transaction		13	13
Treasury stock activity | $	$ 57.3		$ 53.9
Treasury stock acquired (in dollars per share)	$ 120.33	$ 108.71