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EARNINGS PER SHARE - BASIC AND DILUTED EARNINGS PER SHARE (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Net income for basic earnings per share	$ 167.3	$ 175.9	$ 240.2	$ 592.6
Net income for diluted earnings per share	$ 167.3	$ 175.9	$ 240.2	$ 592.6
Shares:
Weighted average shares outstanding for basic earnings per share (in shares)	112,689	114,354	113,836	116,170
Effect of dilutive securities on weighted average shares:
Amounts related to employee benefit plans (in shares)	1,773	1,574	1,777	1,902
Weighted average shares outstanding for diluted earnings per share (in shares)	114,462	115,928	115,613	118,072

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