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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Intangible Assets [Line Items] |  |
Gross Carrying Amount, amortizable | $ 617.4 | $ 825.9
Accumulated Amortization | (202.6) | (254.2)
Net, amortizable | 414.8 | 571.7
Non-amortizable |  | 4.8
Gross Carrying Amount, total | 617.4 | 830.7
Net, total | 414.8 | 576.5
Purchased licenses and technologies |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount, amortizable | 617.4 | 818.2
Accumulated Amortization | (202.6) | (248.2)
Net, amortizable | $ 414.8 | 570.0
Customer relationships |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount, amortizable |  | 4.7
Accumulated Amortization |  | (4.5)
Net, amortizable |  | 0.2
Trademarks |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount, amortizable |  | 3.0
Accumulated Amortization |  | (1.5)
Net, amortizable |  | 1.5
In-process research and development |  |
Intangible Assets [Line Items] |  |
Non-amortizable |  | $ 4.8

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