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Summary of Accounting Policies (Disaggregated Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues | $ 1,512.3 | $ 1,462.8 | $ 1,426.6 | $ 1,376.1 | $ 1,335.6 | $ 1,198.2 | $ 1,137.8 | $ 1,182.6 | $ 5,777.8 | $ 4,854.2 | $ 4,727.7
Software and related services |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 3,604.3 | 2,871.1 | 2,477.7
Engineered products and related services |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | $ 2,173.5 | $ 1,983.1 | $ 2,250.0

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