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Shareholders' Equity - Narrative (Details) SFr / shares in Units, SFr in Millions, $ in Millions | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2025 USD ($) shares | Mar. 31, 2025 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2025 CHF (SFr) SFr / shares shares | Jun. 30, 2025 USD ($) shares | Mar. 31, 2025 SFr / shares | Mar. 31, 2025 USD ($) shares
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Nominal share capital issued (CHF) | SFr |  |  |  | SFr 42.2 |  |  |
Shares issued (in shares) |  |  |  | 168,994,142 | 168,994,142 |  | 168,994,000
Shares, par value (in CHF per share) | SFr / shares |  |  |  | SFr 0.25 |  | SFr 0.25 |
Treasury, at cost, shares (in shares) |  |  |  | 21,442,654 | 21,442,654 |  | 20,485,000
Adjusted share capital period (in years) |  |  |  | 5 years |  |  |
Maximum percentage of shares held by the company and its subsidiaries |  |  |  | 10.00% | 10.00% |  |
Maximum shares available for purchase (in shares) |  |  |  | 16,900,000 | 16,900,000 |  |
Shares acquired for cancellation (in shares) |  |  |  | 8,200,000 |  |  |
Shares acquired for equity incentive plans or potential acquisitions (in shares) |  |  |  | 13,200,000 |  |  |
2023 Share Repurchase Program |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Period for which repurchase program will remain in effect (in years) |  |  | 3 years |  |  |  |
Share repurchase, authorized amount (up to) | $ |  |  | $ 1,000.0 |  |  |  | $ 1,600.0
Increase in authorized amount under share repurchase program | $ |  | $ 600.0 |  |  |  |  |
Amount available for repurchase | $ |  |  |  |  | $ 524.3 |  |
Cancellation of treasury shares (in shares) | 8,200,000 |  |  |  |  |  |
Cancellation of treasury shares | $ | $ 712.2 |  |  |  |  |  |
Common Stock Capital Shares Reserved For Future Issuance Employee Equity Incentive Plans |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Shares that may be issued out of conditional capital (in shares) |  |  |  | 25,000,000 | 25,000,000 |  |
Common Stock Capital Shares Reserved For Future Issuance Conversion Rights Under Future Convertible Bond Issuance |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Shares that may be issued out of conditional capital (in shares) |  |  |  | 25,000,000 | 25,000,000 |  |
Minimum |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Number of adjusted share capital (in shares) |  |  |  | 155,795,958 | 155,795,958 |  |
Maximum |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Number of adjusted share capital (in shares) |  |  |  | 190,417,282 | 190,417,282 |  |

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