LEASES - Components of Lease Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Operating lease costs including variable costs	$ 175.9	$ 195.6
Short-term lease costs	5.2	11.0
Less: sublease income	2.4	2.8
Net lease cost	$ 178.7	$ 203.8