LEASE COMMITMENTS - Operating Lease Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Lease Commitments [Abstract]
Operating lease cost	$ 32.0	$ 33.8
Variable lease cost	4.9	6.7
Short-term lease cost	4.8	5.0
Total operating lease costs	$ 41.7	$ 45.5