SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Sep. 30, 2019
Debt Conversion [Line Items]
Decrease in Capital Expenditures Incurred but not yet Paid	$ (14.0)
Capital Expenditures Incurred but Not yet Paid		$ (12.1)
Notes Receivable, Fair Value Disclosure			$ 110.0
Cash paid during period for:
Interest	80.0	99.7
Income taxes, net of refunds	5.8	(2.2)
Disclosure of non-cash financing and investing activities:
Conversion of zero-coupon convertible debt	$ 0.0	$ 7.3