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Net Income Per Share (Tables) | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Schedule of net income (loss) 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 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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