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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, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Earnings Per Share [Abstract] |  |  |  |
Net income for basic earnings per share | $ 116.3 | $ 73.7 | $ 228.6 | $ 72.9
Net income for diluted earnings per share | $ 116.3 | $ 73.7 | $ 228.6 | $ 72.9
Shares: |  |  |  |
Weighted average shares outstanding for basic earnings per share (in shares) | 107,731 | 114,273 | 108,347 | 114,409
Effect of dilutive securities on weighted average shares: |  |  |  |
Amounts related to employee benefit plans (in shares) | 1,527 | 1,377 | 1,705 | 1,780
Weighted average shares outstanding for diluted earnings per share (in shares) | 109,258 | 115,650 | 110,052 | 116,189

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