SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Debt Conversion [Line Items]
Noncash conversion of zero-coupon convertible debt	$ 0.0	$ 1,762.5
Fair Value of Assets Acquired	9.0	16.7
Capital Expenditures Incurred but Not yet Paid	(2.4)	(1.4)
Cash paid during period for:
Interest	71.6	14.9
Income taxes, net of refunds	32.9	23.1
Disclosure of non-cash financing and investing activities:
Restricted Stock Awards And Performance Shares Surrendered	15.1	7.8
Other Significant Noncash Transaction, Value of Consideration Given	$ 11.9	$ 33.2