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3. Intangible Assets, Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Finite-Lived Intangible Assets, Net [Abstract]            
Purchase Price $ 601.7     $ 601.7   $ 608.1
Accumulated Amortization (421.4)     (421.4)   (413.4)
Net Carrying Amount 180.3     180.3   194.7
Amortization [Abstract]            
Amortization expense 7.2   $ 7.2 14.4 $ 13.1  
Intangible Assets, Gross (Excluding Goodwill) 606.3     $ 606.3   $ 612.9
Customer Relationships [Member]            
Acquired Finite-Lived Intangible Assets [Line Items]            
Finite-Lived Intangible Assets, Remaining Amortization Period       5 years 4 months 17 days   5 years 6 months 3 days
Finite-Lived Intangible Assets, Net [Abstract]            
Purchase Price 114.0     $ 114.0   $ 116.6
Accumulated Amortization (89.1)     (89.1)   (87.2)
Net Carrying Amount 24.9     $ 24.9   $ 29.4
Know How [Member]            
Acquired Finite-Lived Intangible Assets [Line Items]            
Finite-Lived Intangible Assets, Remaining Amortization Period       4 years 3 months   4 years 9 months
Finite-Lived Intangible Assets, Net [Abstract]            
Purchase Price 193.7     $ 193.7   $ 196.6
Accumulated Amortization (174.7)     (174.7)   (175.4)
Net Carrying Amount 19.0     $ 19.0   $ 21.2
Developed Technology Rights [Member]            
Acquired Finite-Lived Intangible Assets [Line Items]            
Finite-Lived Intangible Assets, Remaining Amortization Period       13 years 8 months 4 days   14 years
Finite-Lived Intangible Assets, Net [Abstract]            
Purchase Price 217.6     $ 217.6   $ 218.1
Accumulated Amortization (111.8)     (111.8)   (107.1)
Net Carrying Amount 105.8     $ 105.8   $ 111.0
Licensing Agreements [Member]            
Acquired Finite-Lived Intangible Assets [Line Items]            
Finite-Lived Intangible Assets, Remaining Amortization Period       7 years 3 months 3 days   7 years 8 months 23 days
Finite-Lived Intangible Assets, Net [Abstract]            
Purchase Price 65.3     $ 65.3   $ 65.6
Accumulated Amortization (39.0)     (39.0)   (37.4)
Net Carrying Amount 26.3     $ 26.3   $ 28.2
Trade Names [Member]            
Acquired Finite-Lived Intangible Assets [Line Items]            
Finite-Lived Intangible Assets, Remaining Amortization Period       7 years 6 months 29 days   7 years 9 months 25 days
Finite-Lived Intangible Assets, Net [Abstract]            
Purchase Price 6.4     $ 6.4   $ 6.6
Accumulated Amortization (4.3)     (4.3)   (4.2)
Net Carrying Amount 2.1     $ 2.1   $ 2.4
Noncompete Agreements [Member]            
Acquired Finite-Lived Intangible Assets [Line Items]            
Finite-Lived Intangible Assets, Remaining Amortization Period       3 years 5 months 19 days   3 years 10 months 13 days
Finite-Lived Intangible Assets, Net [Abstract]            
Purchase Price 4.6     $ 4.6   $ 4.5
Accumulated Amortization (2.4)     (2.4)   (2.0)
Net Carrying Amount 2.2     $ 2.2   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