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SHAREHOLDERS’ EQUITY - Narrative (Details) € / shares in Units, $ in Millions |  |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 06, 2024 USD ($) | Feb. 08, 2024 USD ($) shares | Feb. 06, 2024 USD ($) | Feb. 05, 2024 USD ($) | Feb. 04, 2024 vote shares | Dec. 31, 2025 USD ($) shares | Dec. 31, 2024 USD ($) shares | Dec. 31, 2023 USD ($) shares | Dec. 31, 2025 EUR (€) € / shares shares | Dec. 31, 2022 USD ($)
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Authorized share capital | € |  |  |  |  |  |  |  |  | € 75,000,000 |
Number of shares authorized (in shares) | shares |  |  |  |  |  | 2,495,175,000 |  |  | 2,495,175,000 |
Par value of share (EUR per shares) | € / shares |  |  |  |  |  |  |  |  | € 0.0300580119630888 |
Number of shares outstanding (in shares) | shares |  |  |  |  |  | 557,667,387 | 553,631,196 | 384,499,607 | 557,667,387 |
Share capital |  |  |  |  |  | $ 18.6 | $ 18.4 |  |  |
Total shareholders' equity |  |  |  |  |  | 5,820.9 | 5,008.4 | $ (156.8) |  | $ (73.9)
Number of votes per common shares | vote |  |  |  |  | 1 |  |  |  |  |
Payments of debt issuance costs |  | $ 102.4 |  |  |  | 0.0 | 2,561.4 | 0.0 |  |
IPO |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Payments of debt issuance costs |  |  |  | $ 1,365.0 |  |  |  |  |  |
Overallotment option |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Payments of debt issuance costs | $ 140.8 |  | $ 102.4 |  |  |  |  |  |  |
Follow on Offering |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Payments of debt issuance costs | 1,079.2 |  |  |  |  |  |  |  |  |
Parent company (Amer Sports Holding (Cayman) Limited) |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Amount of loan equitized |  |  |  |  |  | 2,560.0 |  |  |  |
Class A Voting Shares |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Number of shares outstanding (in shares) | shares |  |  |  |  | 384,499,607 |  |  |  |  |
Ordinary shares issued (in shares) | shares |  |  |  |  | 384,499,607 |  |  |  |  |
Class B Voting Shares |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Number of shares outstanding (in shares) | shares |  | 505,249,607 |  |  |  |  |  |  |  |
Ordinary shares issued (in shares) | shares |  | 505,249,607 |  |  |  |  |  |  |  |
Share capital |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Total shareholders' equity |  |  |  |  |  | 18.6 | 18.4 | 642.2 |  | 642.2
Share premium |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Total shareholders' equity |  |  |  |  |  | $ 3,251.2 | $ 3,189.1 | $ 0.0 |  | $ 0.0
Share premium | IPO |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Share issue related cost |  | $ 61.6 |  |  |  |  |  |  |  |
Share premium | Follow on Offering |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Share issue related cost | $ 34.1 |  |  |  |  |  |  |  |  |

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