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Basis of Presentation and summary of significant accounting policies - Principles of consolidation (Details)
Sep. 30, 2025
Sep. 01, 2025
Aug. 31, 2025
Hart      
Noncontrolling Interest [Line Items]      
Percentage owned by parent (in percent) 60.00% 60.00%  
Hart      
Noncontrolling Interest [Line Items]      
Non controlling minority interest 40.00% 40.00%  
Hart | Hart HoldCo, LLC ("the Hart Seller")      
Noncontrolling Interest [Line Items]      
Percentage owned by parent     100.00%