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Goodwill and Intangible Assets - Intangible Assets by Major Class (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Schedule of Intangible Assets by Major Class [Line Items]    
Cost $ 76.3 $ 76.1
Accumulated amortization (68.6) (65.3)
Net 7.7 10.8
Patents and licensing    
Schedule of Intangible Assets by Major Class [Line Items]    
Cost 24.7 24.7
Accumulated amortization (24.1) (23.0)
Net 0.6 1.7
Technology    
Schedule of Intangible Assets by Major Class [Line Items]    
Cost 3.3 3.3
Accumulated amortization (2.9) (2.7)
Net 0.4 0.6
Trademarks    
Schedule of Intangible Assets by Major Class [Line Items]    
Cost 1.2 1.2
Accumulated amortization (1.2) (1.2)
Net 0.0 0.0
Customer relationships    
Schedule of Intangible Assets by Major Class [Line Items]    
Cost 39.0 38.9
Accumulated amortization (32.5) (30.8)
Net 6.5 8.1
Customer contracts    
Schedule of Intangible Assets by Major Class [Line Items]    
Cost 8.1 8.0
Accumulated amortization (7.9) (7.6)
Net $ 0.2 $ 0.4