REPURCHASES OF COMMON STOCK (Details) - Common Class A [Member] - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Repurchases of Common Stock [Abstract]
Common stock repurchased (in shares)	0.3	0.6	1.0	2.1
Common stock repurchased	$ 17.4	$ 28.2	$ 41.7	$ 104.1
Available for repurchase under the repurchase program	$ 405.3		$ 405.3