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3. Intangible Assets, Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Finite-Lived Intangible Assets, Net [Abstract]            
Purchase Price $ 577.9     $ 577.9   $ 608.1
Accumulated Amortization (405.4)     (405.4)   (413.4)
Net Carrying Amount 172.5     172.5   194.7
Amortization [Abstract]            
Amortization expense 7.3 $ 7.2   21.7 $ 20.3  
Intangible Assets, Gross (Excluding Goodwill) 582.5     $ 582.5   $ 612.9
Customer Relationships [Member]            
Acquired Finite-Lived Intangible Assets [Line Items]            
Finite-Lived Intangible Assets, Remaining Amortization Period       5 years 4 months 13 days   5 years 6 months 3 days
Finite-Lived Intangible Assets, Net [Abstract]            
Purchase Price 112.3     $ 112.3   $ 116.6
Accumulated Amortization (89.6)     (89.6)   (87.2)
Net Carrying Amount 22.7     $ 22.7   $ 29.4
Know How [Member]            
Acquired Finite-Lived Intangible Assets [Line Items]            
Finite-Lived Intangible Assets, Remaining Amortization Period       4 years   4 years 9 months
Finite-Lived Intangible Assets, Net [Abstract]            
Purchase Price 173.3     $ 173.3   $ 196.6
Accumulated Amortization (155.4)     (155.4)   (175.4)
Net Carrying Amount 17.9     $ 17.9   $ 21.2
Developed Technology Rights [Member]            
Acquired Finite-Lived Intangible Assets [Line Items]            
Finite-Lived Intangible Assets, Remaining Amortization Period       13 years 6 months 25 days   14 years
Finite-Lived Intangible Assets, Net [Abstract]            
Purchase Price 216.1     $ 216.1   $ 218.1
Accumulated Amortization (113.5)     (113.5)   (107.1)
Net Carrying Amount 102.6     $ 102.6   $ 111.0
Licensing Agreements [Member]            
Acquired Finite-Lived Intangible Assets [Line Items]            
Finite-Lived Intangible Assets, Remaining Amortization Period       7 years 10 days   7 years 8 months 23 days
Finite-Lived Intangible Assets, Net [Abstract]            
Purchase Price 65.1     $ 65.1   $ 65.6
Accumulated Amortization (39.8)     (39.8)   (37.4)
Net Carrying Amount 25.3     $ 25.3   $ 28.2
Trade Names [Member]            
Acquired Finite-Lived Intangible Assets [Line Items]            
Finite-Lived Intangible Assets, Remaining Amortization Period       7 years 5 months 23 days   7 years 9 months 25 days
Finite-Lived Intangible Assets, Net [Abstract]            
Purchase Price 6.4     $ 6.4   $ 6.6
Accumulated Amortization (4.4)     (4.4)   (4.2)
Net Carrying Amount 2.0     $ 2.0   $ 2.4
Noncompete Agreements [Member]            
Acquired Finite-Lived Intangible Assets [Line Items]            
Finite-Lived Intangible Assets, Remaining Amortization Period       3 years 3 months 10 days   3 years 10 months 13 days
Finite-Lived Intangible Assets, Net [Abstract]            
Purchase Price 4.6     $ 4.6   $ 4.5
Accumulated Amortization (2.6)     (2.6)   (2.0)
Net Carrying Amount 2.0     $ 2.0   2.5
Other Intangible Assets [Member]            
Acquired Finite-Lived Intangible Assets [Line Items]            
Finite-Lived Intangible Assets, Remaining Amortization Period        
Finite-Lived Intangible Assets, Net [Abstract]            
Purchase Price 0.1     $ 0.1   0.1
Accumulated Amortization (0.1)     (0.1)   (0.1)
Net Carrying Amount 0.0     0.0   0.0
In Process Research and Development [Member]            
Amortization [Abstract]            
Indefinite-lived Intangible Assets (Excluding Goodwill) $ 4.6     $ 4.6   $ 4.8