Share Capital and Capital reserve - Narrative (Details) |
3 Months Ended | 9 Months Ended | 12 Months Ended | |||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Jul. 10, 2025
USD ($)
$ / shares
|
Nov. 06, 2023
USD ($)
|
Sep. 30, 2026
EUR (€)
$ / shares
|
Jun. 30, 2026
EUR (€)
|
Jun. 30, 2026
USD ($)
$ / shares
|
Mar. 31, 2026
EUR (€)
|
Mar. 31, 2026
USD ($)
|
Dec. 31, 2025
EUR (€)
|
Dec. 31, 2025
USD ($)
|
Sep. 30, 2025
EUR (€)
|
Jun. 30, 2025
USD ($)
$ / shares
|
Mar. 31, 2025
EUR (€)
|
Mar. 31, 2025
USD ($)
$ / shares
|
Dec. 31, 2024
EUR (€)
|
Dec. 31, 2024
USD ($)
$ / shares
|
Sep. 30, 2026
EUR (€)
shares
|
Sep. 30, 2026
USD ($)
shares
|
Sep. 30, 2025
EUR (€)
|
Sep. 30, 2025
USD ($)
|
Dec. 31, 2025
EUR (€)
shares
|
Dec. 31, 2025
USD ($)
shares
|
Sep. 30, 2026
$ / shares
|
Jun. 22, 2026
$ / shares
|
Dec. 31, 2025
$ / shares
|
Oct. 16, 2025
$ / shares
|
Jul. 10, 2024
$ / shares
|
|
| Disclosure of classes of share capital [line items] | ||||||||||||||||||||||||||
| Other reserves | € 22,500,000 | € (12,900,000) | € 22,500,000 | € (12,900,000) | ||||||||||||||||||||||
| Purchase of treasury shares | $ | $ 500 | |||||||||||||||||||||||||
| Payments to acquire or redeem entity's shares | 23,700,000 | € 151,400,000 | ||||||||||||||||||||||||
| Dividends paid, ordinary shares per share | $ / shares | € 0.17 | $ 0.17 | $ 0.17 | $ 0.17 | $ 0.17 | |||||||||||||||||||||
| Dividends proposed or declared before financial statements authorised for issue but not recognised as distribution to owners per share | $ / shares | € 0.17 | |||||||||||||||||||||||||
| Dividends paid, ordinary shares | € 20,800,000 | $ 23,800,000 | € 20,300,000 | $ 23,800,000 | 20,600,000 | $ 24,200,000 | € 21,300,000 | $ 24,900,000 | € 23,100,000 | $ 25,900,000 | € 25,300,000 | $ 26,200,000 | € 61,700,000 | $ 71,800,000 | € 69,700,000 | $ 77,000,000.0 | ||||||||||
| Information about how expected volatility was determined, share options granted | Expected volatility is a measure of the amount by which the Company's share price returns are expected to fluctuate during the life of an option, at the grant date. The expected volatility is estimated based on the historical share price volatility of the Company over a three to five year period, of 27.4% to 29.7%. The historical share price volatility is used as a guide to expected volatility over a period that is commensurate with the expected life of the option. The expected volatility input of 28.8% is calculated as the mean of the Company's volatility over a historical three, four and five-year period. | Expected volatility is a measure of the amount by which the Company's share price returns are expected to fluctuate during the life of an option, at the grant date. The expected volatility is estimated based on the historical share price volatility of the Company over a three to five year period, of 27.4% to 29.7%. The historical share price volatility is used as a guide to expected volatility over a period that is commensurate with the expected life of the option. The expected volatility input of 28.8% is calculated as the mean of the Company's volatility over a historical three, four and five-year period. | ||||||||||||||||||||||||
| Cash flow hedges | ||||||||||||||||||||||||||
| Disclosure of classes of share capital [line items] | ||||||||||||||||||||||||||
| Other reserves | € 20,100,000 | (16,800,000) | € 20,100,000 | (16,800,000) | ||||||||||||||||||||||
| Cost of hedging reserve | ||||||||||||||||||||||||||
| Disclosure of classes of share capital [line items] | ||||||||||||||||||||||||||
| Reserve of change in value of forward elements of forward contracts | € 2,400,000 | € 3,900,000 | € 2,400,000 | 3,900,000 | ||||||||||||||||||||||
| Key Management Personnel Of Entity Or Parent, Non-Executive Director [Member] | Restricted shares | ||||||||||||||||||||||||||
| Disclosure of classes of share capital [line items] | ||||||||||||||||||||||||||
| Shares issued, price per share (in dollars per share) | $ / shares | $ 17.11 | $ 10.02 | $ 16.71 | $ 16.33 | ||||||||||||||||||||||
| Other equity instruments granted in share-based payment arrangement, per director | $ | $ 36,738 | $ 140,000 | $ 140,000 | |||||||||||||||||||||||
| Ordinary shares | ||||||||||||||||||||||||||
| Disclosure of classes of share capital [line items] | ||||||||||||||||||||||||||
| Shares issued, price per share (in dollars per share) | $ / shares | $ 10.33 | $ 16.28 | ||||||||||||||||||||||||
| Transaction costs | € 0.4 | |||||||||||||||||||||||||
| Number of shares repurchased | shares | 2,664,169 | 2,664,169 | 21,397,779 | 21,397,779 | ||||||||||||||||||||||
| Payments to acquire or redeem entity's shares | € 23,700,000 | $ 27,600,000 | € 314.3 | $ 348.9 | ||||||||||||||||||||||