SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Debt Conversion [Line Items]
Decrease in Capital Expenditures Incurred but not yet Paid	$ 4.8
Capital Expenditures Incurred but Not yet Paid		$ 2.8
Cash paid during period for:
Interest	188.2	102.2
Income taxes, net of refunds	148.6	127.9
Disclosure of non-cash financing and investing activities:
Restricted Stock Awards And Performance Shares Surrendered	45.1	46.2
Conversion of zero-coupon convertible debt	0.0	12.8
Fair Value of Assets Acquired	0.0	$ 0.9
Other Significant Noncash Transaction, Value of Consideration Given	$ 43.0