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NET INCOME PER SHARE (Tables)
12 Months Ended
Dec. 31, 2023
Earnings Per Share [Abstract]  
Calculation of Basic and Diluted Net Income (Loss) Per Share
The following table sets forth the calculation of basic and diluted net income per share (in millions, except per share data):
 Year Ended December 31,
 202320222021
Numerator:   
Net income$374.7 $369.5 $292.6 
Denominator:
Denominator for basic net income per share — weighted-average outstanding shares
405.3 396.3 392.2 
Effect of dilutive securities:
Stock options, restricted stock awards and restricted stock units1.6 1.5 2.0 
Denominator for diluted net income per share — weighted-average outstanding shares
406.9 397.8 394.2 
Net income per share — basic
$0.92 $0.93 $0.75 
Net income per share — diluted
$0.92 $0.93 $0.74 
Schedule of Anti-Dilutive Securities Excluded From Computation of Earnings Per Share
The following table summarizes the shares underlying the unvested performance-based restricted stock and anti-dilutive securities excluded from the basic and diluted earnings per share calculations (in millions):
 Year Ended December 31,
 202320222021
Performance-based restricted stock awards
0.2 0.4 0.4 
Anti-dilutive securities
0.7 1.0 0.4