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STOCKHOLDERS' EQUITY (Tables)
9 Months Ended
Sep. 30, 2023
STOCKHOLDERS' EQUITY  
Schedule of computation of diluted weighted average number of common shares outstanding
 (in millions) Three Months Ended
September 30,



Nine Months Ended
September 30,
 
2023


2022



2023



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