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Net Income Per Share (Tables) | 6 Months Ended
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Jul. 31, 2020
Earnings Per Share [Abstract] |
Schedule of computation of the numerators and denominators used in the basic and diluted net loss per share amounts | The following table sets forth the computation of the numerators and denominators used in the basic and diluted net income per share amounts:
| Three Months Ended July 31, |  | Six Months Ended July 31,
(in millions, except per share data) | 2020 |  | 2019 |  | 2020 |  | 2019
Numerator: |  |  |  |  |  |  |
Net income | $ | 98.2 |  |  | $ | 40.2 |  |  | $ | 164.7 |  |  | $ | 16.0 |
Denominator: |  |  |  |  |  |  |
Denominator for basic net income per share—weighted average shares | 219.2 |  |  | 219.6 |  |  | 219.2 |  |  | 219.6 |
Effect of dilutive securities | 3.0 |  |  | 2.8 |  |  | 2.8 |  |  | 2.7 |
Denominator for dilutive net income per share | 222.2 |  |  | 222.4 |  |  | 222.0 |  |  | 222.3 |
Basic net income per share | $ | 0.45 |  |  | $ | 0.18 |  |  | $ | 0.75 |  |  | $ | 0.07 |
Diluted net income per share | $ | 0.44 |  |  | $ | 0.18 |  |  | $ | 0.74 |  |  | $ | 0.07 |

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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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