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STOCKHOLDERS' EQUITY (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Computation of diluted earnings:        
Net income $ 104.2 $ 97.8 $ 210.4 $ 163.3
Add: Interest expense from assumed conversion of convertible notes, net of tax 1.1 1.1 3.1 3.3
Net income for diluted earnings per share calculation $ 105.3 $ 98.9 $ 213.5 $ 166.6
Computation of diluted weighted average shares outstanding:        
Basic weighted average shares outstanding 48,406,473 49,583,317 49,285,143 50,345,293
Incremental shares from assumed exercise of stock options and vesting of restricted stock units 282,312 386,169 379,331 561,689
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 51,470,603 52,751,304 52,446,292 53,688,800