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Net Income Per Common Share (Tables) | 6 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Schedule of earnings per share, basic and diluted | 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 |  | Six Months Ended
| September 30, |  | September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Net income | $ | 96.3 |  |  | $ | 189.2 |  |  | $ | 132.0 |  |  | $ | 359.7 |
Weighted average common shares outstanding | 235.8 |  |  | 233.3 |  |  | 235.5 |  |  | 231.4 |
Dilutive effect of stock options and RSUs | 4.3 |  |  | 4.5 |  |  | 4.2 |  |  | 4.4 |
Dilutive effect of 2007 Junior Convertible Debt | — |  |  | 0.7 |  |  | — |  |  | 2.4 |
Dilutive effect of 2015 Senior Convertible Debt | 11.7 |  |  | 6.3 |  |  | 12.3 |  |  | 5.6 |
Dilutive effect of 2017 Senior Convertible Debt | — |  |  | — |  |  | — |  |  | — |
Dilutive effect of 2017 Junior Convertible Debt | — |  |  | — |  |  | — |  |  | — |
Weighted average common and potential common shares outstanding | 251.8 |  |  | 244.8 |  |  | 252.0 |  |  | 243.8 |
Basic net income per common share | $ | 0.41 |  |  | $ | 0.81 |  |  | $ | 0.56 |  |  | $ | 1.55 |
Diluted net income per common share | $ | 0.38 |  |  | $ | 0.77 |  |  | $ | 0.52 |  |  | $ | 1.48 |
Schedule of convertible debt | The following table sets forth the applicable Conversion Rates adjusted for dividends declared since issuance of such series of Convertible Debt and the applicable Incremental Share Factors and Maximum Conversion Rates as adjusted for dividends paid since the applicable issuance date:
| Dividend adjusted rates as of September 30, 2018
| Conversion Rate, adjusted |  | Approximate Conversion Price, adjusted |  | Incremental Share Factor, adjusted |  | Maximum Conversion Rate, adjusted
2017 Senior Convertible Debt | 10.2005 |  |  | $ | 98.03 |  |  | 5.1002 |  |  | 14.5357 |
2015 Senior Convertible Debt | 15.9069 |  |  | $ | 62.87 |  |  | 7.9535 |  |  | 22.2697 |
2017 Junior Convertible Debt | 10.3827 |  |  | $ | 96.31 |  |  | 5.1914 |  |  | 14.5357 |
he following is the weighted average conversion price per share used in calculating the dilutive effect (See Note 13 for details on the convertible debt):
| Three Months Ended |  | Six Months Ended
| September 30, |  | September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
2007 Junior Convertible Debt (1) | $ | — |  |  | $ | 23.58 |  |  | $ | — |  |  | $ | 23.64 |
2015 Senior Convertible Debt | $ | 63.02 |  |  | $ | 64.06 |  |  | $ | 63.14 |  |  | $ | 64.21 |
2017 Senior Convertible Debt | $ | 98.27 |  |  | $ | 99.90 |  |  | $ | 98.47 |  |  | $ | 100.13 |
2017 Junior Convertible Debt | $ | 96.55 |  |  | $ | 98.15 |  |  | $ | 96.74 |  |  | $ | 98.37 |
(1) No longer outstanding as of December 31, 2017.

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- Definition Tabular disclosure of borrowings which can be exchanged for a specified number of another security at the option of the issuer or the holder. Disclosures include, but are not limited to, principal amount, amortized premium or discount, and amount of liability and equity components. + References No definition available. + Details
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- References No definition available. + Details
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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/2003/role/presentationRef -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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