SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Debt Conversion [Line Items]
Decrease in Capital Expenditures Incurred but not yet Paid	$ 1.2
Capital Expenditures Incurred but Not yet Paid		$ 4.5
Cash paid during period for:
Interest	96.9	71.8
Income taxes, net of refunds	24.6	11.1
Disclosure of non-cash financing and investing activities:
Restricted Stock Awards And Performance Shares Surrendered	25.0	20.7
Conversion of zero-coupon convertible debt	0.0	$ 31.3
Other Significant Noncash Transaction, Value of Consideration Given	$ 28.4