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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, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Earnings Per Share [Abstract]
Net income for basic earnings per share	$ 23.1	$ 9.3	$ 136.4	$ 237.9
Net income for diluted earnings per share	$ 23.1	$ 9.3	$ 136.4	$ 237.9
Shares:
Weighted average shares outstanding for basic earnings per share (in shares)	96,603	105,101	98,639	107,265
Effect of dilutive securities on weighted average shares:
Amounts related to employee benefit plans (in shares)	1,950	2,030	2,031	1,813
Weighted average shares outstanding for diluted earnings per share (in shares)	98,553	107,131	100,670	109,078

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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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