GOODWILL AND INTANGIBLE ASSETS - SCHEDULE OF GOODWILL (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Goodwill [Roll Forward]
Balance as of January 1	$ 2,681.8	$ 2,601.3
Goodwill acquired during the year	224.5	86.2
Adjustments to goodwill	(4.6)	(5.7)
Goodwill, net	$ 2,901.7	$ 2,681.8