LEASES - Income and Expenses (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Leases [Abstract]
Operating lease cost	$ 15.8	$ 16.6	$ 31.8	$ 33.3
Amortization of right-of-use assets	0.3	0.4	0.6	0.9
Interest on lease liabilities	0.1	0.1	0.1	0.2
Short-term leases costs	0.6	0.8	1.2	1.9
Sublease income	(4.5)	(2.6)	(8.6)	(5.8)
Net lease cost	$ 12.3	$ 15.3	$ 25.1	$ 30.5