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Income Taxes - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2025
Jan. 31, 2025
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Mar. 31, 2024
Income Tax Contingency [Line Items]              
Effective tax rate         (44.40%)    
Unrecognized tax benefits, income tax penalties accrued     $ 103.2 $ 135.8 $ 103.2 $ 135.8  
Unrecognized tax benefits, income tax penalties and interest expense         32.6 31.2  
Unrecognized tax benefits $ 821.2   691.3 821.2 691.3 821.2 $ 792.4
Unrecognized tax benefits that would impact effective tax rate     613.5 $ 706.4 $ 613.5 $ 706.4  
Tax benefit due to settlement reached with tax authorities     $ 24.4        
Basic net income (loss) per common share (in dollars per share)     $ 0.03 $ 0.15 $ (0.06) $ 0.39  
Diluted net income (loss) per common share (in dollars per share)     0.03 $ 0.14 (0.06) $ 0.38  
Unrecognized tax position remeasurement              
Income Tax Contingency [Line Items]              
Basic net income (loss) per common share (in dollars per share)     0.05   0.05    
Diluted net income (loss) per common share (in dollars per share)     $ 0.04   $ 0.05    
Foreign Tax Jurisdiction | Malaysian IRB              
Income Tax Contingency [Line Items]              
Income tax, estimate of possible loss $ 410.0            
Foreign Tax Jurisdiction | German Tax Authorities (GTA)              
Income Tax Contingency [Line Items]              
Income tax, estimate of possible loss   $ 92.0