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Net Income Per Common Share (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |
Net income | $ 242.0 | $ 252.8 | $ 73.6 | $ 123.6 | $ 494.8 | $ 197.2
Basic weighted average common shares outstanding (in shares) | 551,300,000 |  | 512,000,000.0 |  | 549,400,000 | 503,700,000
Dilutive effect of stock options and RSUs (in shares) | 7,300,000 |  | 6,700,000 |  | 7,400,000 | 6,200,000
Diluted weighted average common shares outstanding (in shares) | 565,900,000 |  | 535,300,000 |  | 565,500,000 | 525,500,000
Basic net income per common share (in dollars per share) | $ 0.44 |  | $ 0.14 |  | $ 0.90 | $ 0.39
Diluted net income per common share (in dollars per share) | $ 0.43 |  | $ 0.14 |  | $ 0.87 | $ 0.38
Antidilutive option shares (in shares) | 0 |  | 0 |  | 0 | 0
2015 Senior Convertible Debt |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |
Dilutive effect of Convertible Debt (in shares) | 3,100,000 |  | 10,900,000 |  | 3,700,000 | 12,700,000
2015 Senior Convertible Debt | Weighted Average |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |
Debt instrument, convertible, conversion price (in dollars per share) | $ 30.14 |  | $ 30.49 |  | $ 30.19 | $ 30.55
2017 Senior Convertible Debt |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |
Dilutive effect of Convertible Debt (in shares) | 3,300,000 |  | 3,400,000 |  | 3,700,000 | 1,700,000
2017 Senior Convertible Debt | Weighted Average |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |
Debt instrument, convertible, conversion price (in dollars per share) | $ 47.00 |  | $ 47.54 |  | $ 47.07 | $ 47.64
2020 Senior Convertible Debt | Weighted Average |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |
Debt instrument, convertible, conversion price (in dollars per share) | $ 93.37 |  | $ 0 |  | $ 93.39 | $ 0
2017 Junior Convertible Debt |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |
Dilutive effect of Convertible Debt (in shares) | 900,000 |  | 2,300,000 |  | 1,300,000 | 1,200,000
2017 Junior Convertible Debt | Weighted Average |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |
Debt instrument, convertible, conversion price (in dollars per share) | $ 46.17 |  | $ 46.71 |  | $ 46.24 | $ 46.80

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