Allocation of Personnel Expenses - Summary of Allocation of Personnel Expenses By Nature (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Share-Based Payments [Line iteam]
Share-based payments	$ 5.0	$ 0.5	$ 10.9	$ 3.5
Total expenses	66.3	37.1	166.4	107.0
Expenses by nature
Share-Based Payments [Line iteam]
Wages and salaries	10.0	5.6	29.8	17.0
Social security contributions	2.0	1.6	8.3	4.8
Expenses for pension commitments	0.0	0.0	0.1	0.1
Share-based payments	5.0	0.5	10.9	3.5
Total expenses	$ 17.0	$ 7.8	$ 49.1	$ 25.3

Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483499/205-20-50-7

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481687/323-10-50-3

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483499/205-20-50-5A

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476153/220-40-55-4

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