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Restructuring (Restructuring Program Accrual Balance Reconciliation) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 21 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2024
Restructuring Reserve [Roll Forward]          
Beginning balance     $ 7.4    
Expense $ 3.5 $ 0.0 10.8 $ 2.7  
Utilization     (12.4)    
Ending balance 4.0   4.0    
Severance Costs     9.0    
2025 Restructuring          
Restructuring Reserve [Roll Forward]          
Beginning balance     0.0    
Utilization     (6.2)    
Ending balance 2.8   2.8    
Severance Costs     9.0    
2024 Restructuring          
Restructuring Reserve [Roll Forward]          
Beginning balance     7.2    
Expense     0.0    
Utilization     (6.0)    
Ending balance 1.2   1.2    
2022 Restructuring          
Restructuring Reserve [Roll Forward]          
Beginning balance     0.2    
Expense     0.0   $ 6.7
Utilization     (0.2)    
Ending balance $ 0.0   $ 0.0