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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Intangible Assets [Line Items]
Gross Carrying Amount, amortizable	$ 824.3	$ 825.9
Accumulated Amortization	(269.2)	(254.2)
Net, amortizable	555.1	571.7
Non-amortizable	4.8	4.8
Gross Carrying Amount, total	829.1	830.7
Net, total	559.9	576.5
Purchased licenses and technologies
Intangible Assets [Line Items]
Gross Carrying Amount, amortizable	816.6	818.2
Accumulated Amortization	(263.1)	(248.2)
Net, amortizable	553.5	570.0
Customer relationships
Intangible Assets [Line Items]
Gross Carrying Amount, amortizable	4.7	4.7
Accumulated Amortization	(4.6)	(4.5)
Net, amortizable	0.1	0.2
Trademarks
Intangible Assets [Line Items]
Gross Carrying Amount, amortizable	3.0	3.0
Accumulated Amortization	(1.5)	(1.5)
Net, amortizable	1.5	1.5
In-process research and development
Intangible Assets [Line Items]
Non-amortizable	$ 4.8	$ 4.8

X

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Intangible assets.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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