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STOCKHOLDERS' EQUITY (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Computation of diluted earnings:        
Net income $ 86.1 $ 57.3 $ 106.2 $ 65.5
Add: Interest expense from assumed conversion of convertible notes, net of tax 1.1 1.1 2.0 2.1
Net income for diluted earnings per share calculation $ 87.2 $ 58.4 $ 108.2 $ 67.6
Computation of diluted weighted average shares outstanding:        
Basic weighted average shares outstanding 49,637,589 50,394,610 49,724,478 50,726,281
Incremental shares from assumed exercise of stock options and vesting of restricted stock units 452,008 590,486 412,223 625,625
Incremental shares from assumed conversion of convertible debt 2,781,818 2,781,818 2,781,818 2,781,818
Diluted weighted average shares outstanding 52,871,415 53,766,914 52,918,519 54,133,724