BUSINESS ACQUISITIONS Business Acquisitions in the Aggregate (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2015
Business Acquisition [Line Items]
Proforma consolidated net revenue		$ 2,747.3		$ 8,086.6
Other Long-term Debt	$ 0.0		$ 0.0		$ 57.8
Revenues	2,831.3	$ 2,621.4	8,545.9	7,563.3
Payments to Acquire Businesses, Net of Cash Acquired			79.1	$ 1,799.3
Goodwill, Acquired During Period			49.5		1,009.8
Goodwill	$ 7,362.7		7,362.7		$ 7,400.9	$ 6,424.4
Finite-lived Intangible Assets Acquired			$ 48.5