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Goodwill and Intangible Assets - Goodwill (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Goodwill        
Balance at the beginning of the period     $ 1,507.3  
Current period additions     49.0  
Current period impairment charges $ (96.5) $ 0.0 (96.5) $ 0.0
Current period adjustments     (0.2)  
Foreign currency effect     90.3  
Balance at the end of the period 1,549.9   1,549.9  
BSI BioSpin        
Goodwill        
Balance at the beginning of the period     221.2  
Current period additions     0.0  
Current period impairment charges     (42.5)  
Current period adjustments     0.0  
Foreign currency effect     23.8  
Balance at the end of the period 202.5   202.5  
BSI CALID        
Goodwill        
Balance at the beginning of the period     716.0  
Current period additions     49.0  
Current period impairment charges     0.0  
Current period adjustments     0.1  
Foreign currency effect     56.1  
Balance at the end of the period 821.2   821.2  
BSI NANO        
Goodwill        
Balance at the beginning of the period     569.8  
Current period additions     0.0  
Current period impairment charges     (54.0)  
Current period adjustments     (0.3)  
Foreign currency effect     10.4  
Balance at the end of the period 525.9   525.9  
BEST        
Goodwill        
Balance at the beginning of the period     0.3  
Current period additions     0.0  
Current period impairment charges     0.0  
Current period adjustments     0.0  
Foreign currency effect     0.0  
Balance at the end of the period $ 0.3   $ 0.3