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4. Intangible Assets, Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Acquired Finite-Lived Intangible Assets [Line Items]          
Goodwill, Acquired During Period $ 55.9   $ 55.9    
Finite-Lived Intangible Assets, Net [Abstract]          
Purchase Price 535.4   535.4   $ 576.7
Accumulated Amortization (389.1)   (389.1)   (409.1)
Net Carrying Amount 146.3   146.3   167.6
Amortization [Abstract]          
Amortization expense 6.2 $ 7.3 18.8 $ 21.7  
Intangible Assets, Gross (Excluding Goodwill) 714.2   $ 714.2   $ 663.0
Customer Relationships [Member]          
Acquired Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Remaining Amortization Period     5 years 1 month 17 days   5 years 3 months 7 days
Finite-Lived Intangible Assets, Net [Abstract]          
Purchase Price 99.2   $ 99.2   $ 111.8
Accumulated Amortization (83.1)   (83.1)   (90.7)
Net Carrying Amount 16.1   $ 16.1   $ 21.1
Know How [Member]          
Acquired Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Remaining Amortization Period     3 years   3 years 9 months
Finite-Lived Intangible Assets, Net [Abstract]          
Purchase Price 158.9   $ 158.9   $ 171.6
Accumulated Amortization (145.5)   (145.5)   (154.9)
Net Carrying Amount 13.4   $ 13.4   $ 16.7
Developed Technology Rights [Member]          
Acquired Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Remaining Amortization Period     13 years 21 days   13 years 5 months 1 day
Finite-Lived Intangible Assets, Net [Abstract]          
Purchase Price 206.8   $ 206.8   $ 215.6
Accumulated Amortization (115.6)   (115.6)   (115.6)
Net Carrying Amount 91.2   $ 91.2   $ 100.0
Licensing Agreements [Member]          
Acquired Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Remaining Amortization Period     6 years 1 month 9 days   6 years 9 months 14 days
Finite-Lived Intangible Assets, Net [Abstract]          
Purchase Price 58.2   $ 58.2   $ 64.9
Accumulated Amortization (37.0)   (37.0)   (40.6)
Net Carrying Amount 21.2   $ 21.2   $ 24.3
Trade Names [Member]          
Acquired Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Remaining Amortization Period     6 years 9 months 21 days   7 years 3 months 29 days
Finite-Lived Intangible Assets, Net [Abstract]          
Purchase Price 5.9   $ 5.9   $ 6.3
Accumulated Amortization (4.2)   (4.2)   (4.4)
Net Carrying Amount 1.7   $ 1.7   $ 1.9
Noncompete Agreements [Member]          
Acquired Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Remaining Amortization Period     3 years 3 months 7 days   3 years 9 months 10 days
Finite-Lived Intangible Assets, Net [Abstract]          
Purchase Price 6.4   $ 6.4   $ 6.5
Accumulated Amortization (3.7)   (3.7)   (2.9)
Net Carrying Amount 2.7   2.7   3.6
In Process Research and Development [Member]          
Amortization [Abstract]          
Indefinite-lived Intangible Assets (Excluding Goodwill) $ 178.8   $ 178.8   $ 86.3