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Net Income Per Common Share (Tables) | 9 Months Ended
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Dec. 31, 2023
Earnings Per Share [Abstract] |
Schedule of Computation of Basic and Diluted Earnings Per Share | The following table sets forth the computation of basic and diluted net income per common share (in millions, except per share amounts):
|  |  | Three Months Ended December 31, |  | Nine Months Ended December 31,
|  |  |  |  |  |  | 2023 |  | 2022 |  | 2023 |  | 2022
Net income |  |  |  |  |  |  | $ | 419.2 |  |  | $ | 580.3 |  |  | $ | 1,752.2 |  |  | $ | 1,633.7 |
Basic weighted average common shares outstanding |  |  |  |  |  |  | 540.8 |  |  | 549.2 |  |  | 543.0 |  |  | 551.5 |
Dilutive effect of stock options and RSUs |  |  |  |  |  |  | 4.9 |  |  | 4.8 |  |  | 5.0 |  |  | 5.1 |
Dilutive effect of 2015 Senior Convertible Debt |  |  |  |  |  |  | 0.2 |  |  | 0.4 |  |  | 0.2 |  |  | 0.7 |
Dilutive effect of 2017 Senior Convertible Debt |  |  |  |  |  |  | 0.6 |  |  | 0.9 |  |  | 0.8 |  |  | 1.0 |
Dilutive effect of 2017 Junior Convertible Debt |  |  |  |  |  |  | — |  |  | 0.1 |  |  | — |  |  | 0.1 |
Diluted weighted average common shares outstanding |  |  |  |  |  |  | 546.5 |  |  | 555.4 |  |  | 549.0 |  |  | 558.4 |
Basic net income per common share |  |  |  |  |  |  | $ | 0.78 |  |  | $ | 1.06 |  |  | $ | 3.23 |  |  | $ | 2.96 |
Diluted net income per common share |  |  |  |  |  |  | $ | 0.77 |  |  | $ | 1.04 |  |  | $ | 3.19 |  |  | $ | 2.93 |
Schedule of Convertible Debt | The following is the weighted average conversion price per share used in calculating the dilutive effect (see Note 6 for details on the Convertible Debt):
|  |  | Three Months Ended December 31, |  | Nine Months Ended December 31,
|  |  |  |  |  |  | 2023 |  | 2022 |  | 2023 |  | 2022
2015 Senior Convertible Debt |  |  |  |  |  |  | $ | 28.95 |  |  | $ | 29.52 |  |  | $ | 29.10 |  |  | $ | 29.65 |
2017 Senior Convertible Debt |  |  |  |  |  |  | $ | 45.14 |  |  | $ | 46.03 |  |  | $ | 45.38 |  |  | $ | 46.23 |
2020 Senior Convertible Debt |  |  |  |  |  |  | $ | 91.78 |  |  | $ | 92.74 |  |  | $ | 92.05 |  |  | $ | 92.91 |
2017 Junior Convertible Debt(1) |  |  |  |  |  |  | $ | — |  |  | $ | 45.22 |  |  | $ | 44.81 |  |  | $ | 45.42 |
(1) The weighted average conversion price per share for the 2017 Junior Convertible Debt was prior to the settlement of the outstanding principal amount in May 2023.

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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 -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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