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NET INCOME PER SHARE | 12 Months Ended
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Dec. 31, 2023
Earnings Per Share [Abstract] |
NET INCOME PER SHARE | NET INCOME 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,
| 2023 |  | 2022 |  | 2021
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 units | 1.6 |  |  | 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 |
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,
| 2023 |  | 2022 |  | 2021
Performance-based restricted stock awards | 0.2 |  |  | 0.4 |  |  | 0.4 |
Anti-dilutive securities | 0.7 |  |  | 1.0 |  |  | 0.4 |

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