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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Millions | Total | Common Stock and Additional Paid-in-Capital | Common Stock Held in Treasury | Accumulated Other Comprehensive Loss | Accumulated Other Comprehensive Loss Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings | Retained Earnings Cumulative Effect, Period of Adoption, Adjustment
--- | --- | --- | --- | --- | --- | --- | ---
Balance, common stock shares issued (in shares) at Mar. 31, 2019 |  | 506,500,000 |  |  |  |  |
Beginning balance at Mar. 31, 2019 | $ 5,287.5 | $ 2,679.8 | $ (582.2) | $ (20.7) |  | $ 3,210.6 |
Beginning balance (Accounting Standards Update 2018-02) at Mar. 31, 2019 |  |  |  |  | $ (1.3) |  | $ 1.3
Balance, common stock held in treasury (in shares) at Mar. 31, 2019 |  |  | 31,300,000 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 570.6 |  |  |  |  | 570.6 |
Other comprehensive income | 0.4 |  |  | 0.4 |  |  |
Proceeds from sales of common stock through employee equity incentive plans (shares) |  | 6,400,000 |  |  |  |  |
Proceeds from sales of common stock through employee equity incentive plans | 58.8 | $ 58.8 |  |  |  |  |
RSU and SAR withholdings (shares) |  | (1,200,000) |  |  |  |  |
RSU and SAR withholdings | $ (68.1) | $ (68.1) |  |  |  |  |
Treasury stock used for new issuances (shares) |  | (5,200,000) | (5,200,000) |  |  |  |
Treasury stock used for new issuances |  | $ (81.6) | $ 81.6 |  |  |  |
Repurchase of common stock (in shares) | 0 |  |  |  |  |  |
Shares issued to settle convertible debt (in shares) |  | 10,300,000 |  |  |  |  |
Shares issued to settle convertible debt | $ 351.8 | $ 351.8 |  |  |  |  |
Settlement of convertible debt | (438.1) | (438.1) |  |  |  |  |
Share-based compensation | 172.7 | $ 172.7 |  |  |  |  |
Cash dividend | (350.1) |  |  |  |  | (350.1) |
Balance, common stock shares issued (in shares) at Mar. 31, 2020 |  | 516,800,000 |  |  |  |  |
Ending balance at Mar. 31, 2020 | 5,585.5 | $ 2,675.3 | $ (500.6) | (21.6) |  | 3,432.4 |
Balance, common stock held in treasury (in shares) at Mar. 31, 2020 |  |  | 26,100,000 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 349.4 |  |  |  |  | 349.4 |
Other comprehensive income | (4.6) |  |  | (4.6) |  |  |
Proceeds from sales of common stock through employee equity incentive plans (shares) |  | 5,400,000 |  |  |  |  |
Proceeds from sales of common stock through employee equity incentive plans | 60.3 | $ 60.3 |  |  |  |  |
RSU and SAR withholdings (shares) |  | (1,200,000) |  |  |  |  |
RSU and SAR withholdings | $ (64.6) | $ (64.6) |  |  |  |  |
Treasury stock used for new issuances (shares) |  | (4,200,000) | (4,200,000) |  |  |  |
Treasury stock used for new issuances |  | $ (66.8) | $ 66.8 |  |  |  |
Repurchase of common stock (in shares) | 0 |  |  |  |  |  |
Shares issued to settle convertible debt (in shares) |  | 52,200,000 |  |  |  |  |
Shares issued to settle convertible debt | $ 3,171.1 | $ 3,171.1 |  |  |  |  |
Settlement of convertible debt | (3,622.1) | (3,622.1) |  |  |  |  |
Purchase of capped call options | (35.8) | (35.8) |  |  |  |  |
Issuance of 2020 Senior Convertible Debt | 87.7 | 87.7 |  |  |  |  |
Share-based compensation | 198.5 | $ 198.5 |  |  |  |  |
Cash dividend | $ (388.3) |  |  |  |  | (388.3) |
Balance, common stock shares issued (in shares) at Mar. 31, 2021 | 568,958,158 | 569,000,000.0 |  |  |  |  |
Ending balance at Mar. 31, 2021 | $ 5,337.1 | $ 2,403.6 | $ (433.8) | (26.2) |  | 3,393.5 |
Balance, common stock held in treasury (in shares) at Mar. 31, 2021 | 21,900,970 |  | 21,900,000 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | $ 1,285.5 |  |  |  |  | 1,285.5 |
Other comprehensive income | 5.6 |  |  | 5.6 |  |  |
Proceeds from sales of common stock through employee equity incentive plans (shares) |  | 5,400,000 |  |  |  |  |
Proceeds from sales of common stock through employee equity incentive plans | 70.5 | $ 70.5 |  |  |  |  |
RSU and SAR withholdings (shares) |  | (1,200,000) |  |  |  |  |
RSU and SAR withholdings | $ (84.2) | $ (84.2) |  |  |  |  |
Treasury stock used for new issuances (shares) |  | (4,200,000) | (4,200,000) |  |  |  |
Treasury stock used for new issuances |  | $ (63.1) | $ 63.1 |  |  |  |
Repurchase of common stock (in shares) | 5,600,000 |  | 5,600,000 |  |  |  |
Repurchase of common stock | $ (425.6) |  | $ (425.6) |  |  |  |
Shares issued to settle convertible debt (in shares) |  | 8,800,000 |  |  |  |  |
Shares issued to settle convertible debt | 670.7 | $ 670.7 |  |  |  |  |
Settlement of convertible debt | (668.5) | (668.5) |  |  |  |  |
Share-based compensation | 207.5 | $ 207.5 |  |  |  |  |
Cash dividend | $ (503.8) |  |  |  |  | (503.8) |
Balance, common stock shares issued (in shares) at Mar. 31, 2022 | 577,805,396 | 577,800,000 |  |  |  |  |
Ending balance at Mar. 31, 2022 | $ 5,894.8 | $ 2,536.5 | $ (796.3) | $ (20.6) |  | $ 4,175.2 |
Balance, common stock held in treasury (in shares) at Mar. 31, 2022 | 23,304,872 |  | 23,300,000 |  |  |  |

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