GOODWILL AND INTANGIBLE ASSETS (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 179.5	$ 164.5	$ 216.5	$ 179.5	$ 164.5
Finite-Lived Intangible Assets, Future Amortization Expense
Estimated amortization expense, 2013			195.0
Estimated amortization expense, 2014			187.2
Estimated amortization expense, 2015			179.8
Estimated amortization expense, 2016			176.8
Estimated amortization expense, 2017			175.0
Estimated amortization expense, Thereafter			$ 2,899.7