LEASES - Supplemental Balance Sheet (Details) - USD ($) $ in Millions	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Leases [Abstract]
Operating lease right-of-use assets	$ 157.9		$ 0.0
Current portion of operating lease liabilities	38.1	$ 32.0	0.0
Operating lease liabilities	119.1		$ 0.0
Total operating lease liabilities	157.2
Sundry	5.3
Other current liabilities	1.4
Other long-term liabilities	3.7
Total finance lease liabilities	$ 5.1