INCOME TAXES (Settlements) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2020
Income Tax Contingency [Line Items]
Tax settlement	$ 5.3
Increase In sales		$ 106.1	$ 85.7
Intercompany payments related to income tax settlement	106.1	85.7
Liability (refund) adjustment for settlement		$ 17.5
Tax Year 2007 Through 2008
Income Tax Contingency [Line Items]
Tax, penalties, and interest	34.2
Canadian and Provincial | Tax Year 2004 Through 2006
Income Tax Contingency [Line Items]
Tax, penalties, and interest	94.7
Canadian and Provincial | Tax Year 2007 Through 2016
Income Tax Contingency [Line Items]
Tax settlement			$ 13.8
U.S. taxing authorities
Income Tax Contingency [Line Items]
Tax refund received	21.4
U.S. taxing authorities | Tax Year 2013 Through 2021
Income Tax Contingency [Line Items]
Tax refund received	4.7
Foreign tax authority
Income Tax Contingency [Line Items]
Liability (refund) adjustment for settlement	$ 29.9
Forecast
Income Tax Contingency [Line Items]
Liability (refund) adjustment for settlement				$ 1.4
Forecast | U.S. taxing authorities
Income Tax Contingency [Line Items]
Liability (refund) adjustment for settlement				(1.6)
Forecast | U.S. taxing authorities | Tax Year 2013 Through 2021
Income Tax Contingency [Line Items]
Liability (refund) adjustment for settlement				$ 56.7