EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Net Income
Net Income, Basic	$ 199.1	$ 119.9	$ 348.4	$ 234.7
Net Income, Diluted	$ 199.1	$ 119.9	$ 348.4	$ 234.7
Weighted Average Common Shares
Basic (in shares)	33.3	35.1	33.9	35.6
Effect of Dilutive Securities (in shares)	0.5	0.2	0.5	0.2
Diluted (in shares)	33.8	35.3	34.4	35.8
Per Common Share Amount
Net income, Basic (in dollars per share)	$ 5.98	$ 3.42	$ 10.28	$ 6.59
Effect of dilutive securities (in dollars per shares)	(0.09)	(0.02)	(0.15)	(0.03)
Net income, Diluted (in dollars per share)	$ 5.89	$ 3.40	$ 10.13	$ 6.56