SUPPLEMENTAL CASH FLOW DISCLOSURES (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Supplemental Cash Flow Elements [Abstract]
Interest paid during the year	$ 174.2	$ 193.1	$ 81.8
Income taxes paid during the year, net of amount refunded	128.8	99.5	83.9
Fair value of assets acquired	70.3	12,612.9	91.8
Liabilities assumed	35.0	2,466.3	32.9
Non-controlling interest (acquired) assumed	(5.6)	30.9	0.0
Stock and cash paid	40.9	10,115.7	58.9
Less: Cash acquired	0.6	179.6	7.7
Stock used for acquisition	0.0	6,939.7	0.0
Net cash paid	$ 40.3	$ 2,996.4	$ 51.2