SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash paid during period for:
Interest	$ 296.2	$ 239.1	$ 210.7
Income taxes, net of refunds	349.7	348.0	345.7
Disclosure of non-cash financing and investing activities
Noncash conversion of zero-coupon convertible debt	0.3	35.0	39.1
Fair Value of Assets Acquired	0.6	7.3	16.0
Capital Expenditures Incurred but Not yet Paid	$ 22.1	$ 1.6	$ 4.4