OTHER INCOME, NET (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Income and Expenses [Abstract]
AFUDC – Equity	$ 5.7	$ 4.6	$ 4.1
Non-service components of net periodic benefit costs	18.0	16.7	11.8
Other, net	15.9	16.3	7.8
Other income, net	$ 39.6	$ 37.6	$ 23.7