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Stockholders' Equity - Narrative (Details) |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 06, 2025 $ / shares | Sep. 15, 2025 USD ($) $ / shares | Sep. 05, 2025 USD ($) $ / shares | Dec. 31, 2025 USD ($) | Mar. 31, 2025 USD ($) $ / shares shares | Sep. 30, 2025 USD ($) $ / shares shares | Jun. 30, 2025 USD ($) shares | Sep. 30, 2024 USD ($) $ / shares shares | Jun. 30, 2024 USD ($) shares | Sep. 30, 2025 USD ($) $ / shares shares | Sep. 30, 2024 USD ($) $ / shares shares | Mar. 31, 2024 shares | Nov. 30, 2021 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,000,000,000.00
Repurchased shares under authorization (in shares) | shares |  |  |  |  |  | 0 |  |  |  | 0 |  |  |
Stock repurchase program, remaining authorized repurchase amount | $ |  |  |  |  |  | $ 1,560,000,000 |  |  |  | $ 1,560,000,000 |  |  |
Common stock held in treasury (in shares) | shares |  |  |  |  | 39,292,311 | 37,977,550 |  |  |  | 37,977,550 |  |  |
Preferred stock, liquidation preference (in dollars per share) | $ / shares |  |  |  |  | $ 1,000 | $ 1,000 |  |  |  | $ 1,000 |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  | $ 0.001 | $ 0.001 |  |  |  | $ 0.001 |  |  |
Issuance of Series A Preferred Stock | $ |  |  |  |  | $ 1,450,000,000 |  |  |  |  |  |  |  |
Cumulative annual dividend rate (as a percentage) |  |  |  |  | 7.50% |  |  |  |  |  |  |  |
Preferred stock cash dividend paid (in dollars per share) | $ / shares |  | $ 18.750 |  |  |  |  |  |  |  |  |  |  |
Payment of cash dividends on Series A Preferred Stock | $ |  | $ 27,800,000 |  |  |  |  |  |  |  | $ 52,900,000 | $ 0 |  |
Capped options indexed to equity, costs | $ |  |  |  |  |  |  |  |  |  | $ 0 | $ 105,000,000.0 |  |
Cash dividend paid (in dollars per share) | $ / shares |  |  | $ 0.455 |  |  |  |  |  |  |  |  |  |
Cash dividend | $ |  |  | $ 245,800,000 |  |  | $ 245,800,000 | $ 245,500,000 | $ 243,700,000 | $ 242,600,000 |  |  |  |
Dividends declared per common share (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.455 |  | $ 0.454 |  | $ 0.910 | $ 0.906 |  |
Forecast |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend | $ |  |  |  | $ 246,100,000 |  |  |  |  |  |  |  |  |
Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred dividends declared (in dollars per share) | $ / shares | $ 18.750 |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per common share (in dollars per share) | $ / shares | $ 0.455 |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Held in Treasury |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchased shares under authorization (in shares) | shares |  |  |  |  |  |  |  | 200,000 | 800,000 |  |  |  |
Common stock held in treasury (in shares) | shares |  |  |  |  | 39,300,000 | 38,000,000.0 | 38,700,000 | 40,800,000 | 41,300,000 | 38,000,000.0 | 40,800,000 | 41,100,000 |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, conversion ratio |  |  |  |  |  | 16.0060 |  |  |  | 16.0060 |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, conversion ratio |  |  |  |  |  | 19.6080 |  |  |  | 19.6080 |  |  |
Depository shares |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Series A Preferred Stock (shares) | shares |  |  |  |  | 29,700,000 |  |  |  |  |  |  |  |
Convertible preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Series A Preferred Stock (shares) | shares |  |  |  |  | 1,500,000 |  |  |  |  |  |  |  |
Capped options indexed to equity, costs | $ |  |  |  |  | $ 55,100,000 |  |  |  |  |  |  |  |
Convertible preferred stock | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Option indexed to equity, strike price (in dollars per share) | $ / shares |  |  |  |  | $ 71.40 |  |  |  |  |  |  |  |

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