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4. Intangible Assets, Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Acquired Finite-Lived Intangible Assets [Line Items]      
Goodwill, Acquired During Period $ 0.4    
Finite-Lived Intangible Assets, Net [Abstract]      
Purchase Price 556.4   $ 553.5
Accumulated Amortization (421.2)   (412.4)
Net Carrying Amount 135.2   141.1
Amortization [Abstract]      
Amortization expense 6.0 $ 6.3  
Intangible Assets, Gross (Excluding Goodwill) $ 749.0   $ 744.5
Customer Relationships [Member]      
Acquired Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Remaining Amortization Period 5 years   5 years
Finite-Lived Intangible Assets, Net [Abstract]      
Purchase Price $ 105.7   $ 104.7
Accumulated Amortization (92.2)   (89.9)
Net Carrying Amount $ 13.5   $ 14.8
Know How [Member]      
Acquired Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Remaining Amortization Period 2 years 6 months   2 years 9 months 18 days
Finite-Lived Intangible Assets, Net [Abstract]      
Purchase Price $ 167.3   $ 166.2
Accumulated Amortization (156.1)   (153.9)
Net Carrying Amount $ 11.2   $ 12.3
Developed Technology Rights [Member]      
Acquired Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Remaining Amortization Period 12 years 8 months 12 days   12 years 9 months 18 days
Finite-Lived Intangible Assets, Net [Abstract]      
Purchase Price $ 211.9   $ 211.1
Accumulated Amortization (124.6)   (121.6)
Net Carrying Amount $ 87.3   $ 89.5
Licensing Agreements [Member]      
Acquired Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Remaining Amortization Period 5 years 7 months 6 days   5 years 9 months 18 days
Finite-Lived Intangible Assets, Net [Abstract]      
Purchase Price $ 59.0   $ 59.0
Accumulated Amortization (39.5)   (38.5)
Net Carrying Amount $ 19.5   $ 20.5
Trade Names [Member]      
Acquired Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Remaining Amortization Period 6 years 3 months 18 days   6 years 7 months 6 days
Finite-Lived Intangible Assets, Net [Abstract]      
Purchase Price $ 6.1   $ 6.1
Accumulated Amortization (4.5)   (4.5)
Net Carrying Amount $ 1.6   $ 1.6
Noncompete Agreements [Member]      
Acquired Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Remaining Amortization Period 3 years   3 years 1 month 6 days
Finite-Lived Intangible Assets, Net [Abstract]      
Purchase Price $ 6.4   $ 6.4
Accumulated Amortization (4.3)   (4.0)
Net Carrying Amount 2.1   2.4
In Process Research and Development [Member]      
Amortization [Abstract]      
Indefinite-lived Intangible Assets (Excluding Goodwill) $ 192.6   $ 191.0