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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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Earnings Per Share [Abstract]
Net income for basic earnings per share	$ 9.3	$ 167.3	$ 237.9	$ 240.2
Net income for diluted earnings per share	$ 9.3	$ 167.3	$ 237.9	$ 240.2
Shares:
Weighted average shares outstanding for basic earnings per share (in shares)	105,101	112,689	107,265	113,836
Effect of dilutive securities on weighted average shares:
Amounts related to employee benefit plans (in shares)	2,030	1,773	1,813	1,777
Weighted average shares outstanding for diluted earnings per share (in shares)	107,131	114,462	109,078	115,613

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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