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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Intangible Assets [Line Items]    
Gross Carrying Amount, amortizable $ 824.8 $ 825.9
Accumulated Amortization (282.9) (254.2)
Net, amortizable 541.9 571.7
Non-amortizable 4.8 4.8
Less: intangible assets held for sale, gross (211.5)  
Less: intangible assets held for sale, accumulated amortization 91.6  
Less: intangible assets held for sale, net (119.9)  
Gross Carrying Amount, total 618.1 830.7
Accumulated Amortization, total (191.3) (254.2)
Net, total 426.8 576.5
Purchased licenses and technologies    
Intangible Assets [Line Items]    
Gross Carrying Amount, amortizable 817.1 818.2
Accumulated Amortization (276.6) (248.2)
Net, amortizable 540.5 570.0
Customer relationships    
Intangible Assets [Line Items]    
Gross Carrying Amount, amortizable 4.7 4.7
Accumulated Amortization (4.7) (4.5)
Net, amortizable 0.0 0.2
Trademarks    
Intangible Assets [Line Items]    
Gross Carrying Amount, amortizable 3.0 3.0
Accumulated Amortization (1.6) (1.5)
Net, amortizable 1.4 1.5
In-process research and development    
Intangible Assets [Line Items]    
Non-amortizable $ 4.8 $ 4.8