EARNINGS PER-SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net Income
Net Income, Basic	$ 87.2	$ 3.8
Net Income, Diluted	$ 87.2	$ 3.8
Weighted Average Common Shares
Basic	43.4	43.0
Effect of Dilutive Securities (in shares)	0.4	0.3
Diluted (in shares)	43.8	43.3
Per Common Share Amount
Net income, Basic (in dollars per share)	$ 2.01	$ 0.09
Effect of Dilutive Securities (in dollars per shares)	(0.02)
Net income, Diluted (in dollars per share)	$ 1.99	$ 0.09