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Net Income Per Common Share (Tables) | 12 Months Ended
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Mar. 31, 2020
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):
| Year Ended March 31,
| 2020 |  | 2019 |  | 2018
Net income | $ | 570.6 |  |  | $ | 355.9 |  |  | $ | 255.4 |
Basic weighted average common shares outstanding | 238.9 |  |  | 236.2 |  |  | 232.9 |
Dilutive effect of stock options and RSUs | 3.4 |  |  | 3.8 |  |  | 4.4 |
Dilutive effect of 2007 Junior Convertible Debt | — |  |  | — |  |  | 1.3 |
Dilutive effect of 2015 Senior Convertible Debt | 13.7 |  |  | 9.9 |  |  | 10.3 |
Dilutive effect of 2017 Senior Convertible Debt | 0.1 |  |  | — |  |  | — |
Dilutive effect of 2017 Junior Convertible Debt | 0.1 |  |  | — |  |  | — |
Diluted weighted average common shares outstanding | 256.2 |  |  | 249.9 |  |  | 248.9 |
Basic net income per common share | $ | 2.39 |  |  | $ | 1.51 |  |  | $ | 1.10 |
Diluted net income per common share | $ | 2.23 |  |  | $ | 1.42 |  |  | $ | 1.03 |
Schedule of Convertible Debt | The following is the weighted average conversion price per share used in calculating the dilutive effect (see Note 7 Debt for details on the convertible debt):
| Year Ended March 31,
| 2020 |  | 2019 |  | 2018
2007 Junior Convertible Debt (1) |  |  |  |  |  |  | $ | 23.59 |
2015 Senior Convertible Debt | $ | 61.80 |  |  | $ | 62.86 |  |  | $ | 63.94 |
2017 Senior Convertible Debt | $ | 96.37 |  |  | $ | 98.03 |  |  | $ | 99.71 |
2017 Junior Convertible Debt | $ | 94.68 |  |  | $ | 96.31 |  |  | $ | 97.96 |
(1)No longer outstanding as of December 31, 2017.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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