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EARNINGS PER SHARE - BASIC AND DILUTED EARNINGS PER SHARE (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Earnings Per Share [Abstract]
Net income for basic earnings per share	$ 91.8	$ 116.3	$ 113.3	$ 228.6
Net income for diluted earnings per share	$ 91.8	$ 116.3	$ 113.3	$ 228.6
Shares:
Weighted average shares outstanding for basic earnings per share (in shares)	98,572	107,731	99,658	108,347
Effect of dilutive securities on weighted average shares:
Amounts related to employee benefit plans (in shares)	1,814	1,527	2,070	1,705
Weighted average shares outstanding for diluted earnings per share (in shares)	100,386	109,258	101,728	110,052

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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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