EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Net Income
Net Income, Basic	$ 80.8	$ 380.7	$ 114.8	$ 719.9
Net Income, Diluted	$ 80.8	$ 380.7	$ 114.8	$ 719.9
Weighted Average Common Shares
Basic (in shares)	35.5	39.9	35.8	40.4
Effect of Dilutive Securities (in shares)	0.2	0.2	0.2	0.3
Diluted (in shares)	35.7	40.1	36.0	40.7
Per Common Share Amount
Net income, Basic (in dollars per share)	$ 2.28	$ 9.54	$ 3.21	$ 17.82
Effect of dilutive securities (in dollars per shares)	(0.02)	(0.05)	(0.02)	(0.13)
Net income, Diluted (in dollars per share)	$ 2.26	$ 9.49	$ 3.19	$ 17.69