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Net Income Per Share | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Net Income Per Share | Net Income Per Share Net income per share was calculated as follows:
| Year Ended December 31,
(in millions, except per share data) | 2020 |  | 2019 |  | 2018
Net income - basic and diluted | $ | 407.3 |  |  | $ | 37.0 |  |  | $ | 21.1 |
Weighted-average common shares outstanding: |  |  |  |  |
Basic | 93.1 |  |  | 91.6 |  |  | 90.2 |
Effect of dilutive securities: |  |  |  |  |
Stock options | 2.4 |  |  | 2.6 |  |  | 3.2 |
Restricted stock units | 0.5 |  |  | 0.4 |  |  | 0.6 |
2024 Notes | 1.8 |  |  | 1.1 |  |  | 1.3 |
Diluted | 97.8 |  |  | 95.7 |  |  | 95.4 |
Net income per share: |  |  |  |  |
Basic | $ | 4.38 |  |  | $ | 0.40 |  |  | $ | 0.23 |
Diluted | $ | 4.16 |  |  | $ | 0.39 |  |  | $ | 0.22 |
Shares which have been excluded from diluted per share amounts because their effect would have been anti-dilutive were 2.5 million, 2.1 million and 0.9 million for 2020, 2019 and 2018, respectively.

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