EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net Income
Net Income, Basic	$ 927.4	$ 193.1	$ 82.7
Net Income, Diluted	$ 927.4	$ 193.1	$ 82.7
Weighted Average Common Shares
Basic (in shares)	42.8	43.1	42.8
Effect of Dilutive Securities (in shares)	0.4	0.4	0.5
Diluted (in shares)	43.2	43.5	43.3
Per Common Share Amount
Net income, Basic (in dollars per share)	$ 21.67	$ 4.48	$ 1.93
Effect of Dilutive Securities (in dollars per shares)	(0.20)	(0.04)	(0.02)
Net income, Diluted (in dollars per share)	$ 21.47	$ 4.44	$ 1.91