REVENUE - Contract balances (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Revenue from Contract with Customer [Abstract]
Contract assets	$ 983.4		$ 966.0
Contract liabilities	(834.7)		(1,012.9)
Net contract assets (liabilities)	148.7		$ (46.9)
Contract assets, increase (decrease)	$ 17.4
Contract with customer, asset, net, current, increase (decrease), (in percent)	1.80%
Contract (liabilities), (increase) decrease	$ 178.2
Contract with customer liability, current, increase (decrease), (in percent)	17.60%
Net contract assets (liabilities), increase (decrease)	$ 195.6
Contract assets (liabilities), current, net, increase (decrease), (in percent)	417.10%
Contract with customer, liability, revenue recognized	$ 112.9	$ 128.4
Contract with customer, performance obligation satisfied in previous period	$ (12.2)	$ (5.3)