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STOCKHOLDERS' EQUITY (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Computation of diluted earnings:    
Net income $ 26.2 $ 20.1
Add: Interest expense from assumed conversion of convertible notes, net of tax 0.9 0.8
Net income for diluted earnings per share calculation $ 27.1 $ 20.9
Computation of diluted weighted average shares outstanding:    
Basic weighted average shares outstanding 45,816,943 49,811,368
Incremental shares from assumed exercise of stock options and vesting of restricted stock units 363,822 381,614
Incremental shares from assumed conversion of convertible debt 2,781,818 2,781,818
Diluted weighted average shares outstanding 48,962,583 52,974,800