REVENUE - Contract balances (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Revenue from Contract with Customer [Abstract]
Contract assets	$ 1,025.0		$ 1,025.0		$ 966.0
Contract liabilities	(804.4)		(804.4)		(1,012.9)
Net contract assets (liabilities)	220.6		220.6		$ (46.9)
Contract assets, increase (decrease)			$ 59.0
Contract with customer, asset, net, current, increase (decrease), (in percent)			6.10%
Contract (liabilities), (increase) decrease			$ 208.5
Contract with customer liability, current, increase (decrease), (in percent)			20.60%
Net contract assets (liabilities), increase (decrease)			$ 267.5
Contract assets (liabilities), current, net, increase (decrease), (in percent)			570.40%
Contract with customer, liability, revenue recognized	102.8	$ 68.7	$ 215.7	$ 197.1
Contract with customer, performance obligation satisfied in previous period	$ 34.2	$ 7.9	$ 22.0	$ 2.6