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v3.21.2

Basis of Presentation and Principles of Consolidation (Narrative) (Details) $ / shares in Units, $ in Millions |  | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 04, 2021 | Sep. 30, 2021 USD ($) $ / shares | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
Stock split conversion ratio | 2 |  |  |  |  |  |
Class A Common Stock, par value (in dollars per share) | $ / shares |  | $ 0.001 |  |  |  |  |
Total equity |  | $ 6,008.7 | $ 5,778.3 | $ 5,451.9 | $ 5,105.2 | $ 4,800.3 | $ 4,596.2
Common Stock |  |  |  |  |  |  |
Total equity |  | 0.6 | 0.6 | 0.6 | 0.6 | 0.6 | 0.6
Common Stock | Stock Split [Member] |  |  |  |  |  |  |
Total equity |  | 0.3 |  | 0.3 | 0.3 |  | 0.3
Additional Paid in Capital |  |  |  |  |  |  |
Total equity |  | 2,289.5 | $ 2,198.9 | 2,068.1 | 1,937.8 | $ 1,834.2 | 1,683.0
Additional Paid in Capital | Stock Split [Member] |  |  |  |  |  |  |
Total equity |  | $ (0.3) |  | $ (0.3) | $ (0.3) |  | $ (0.3)
MTS Test & Simulation |  |  |  |  |  |  |
Maximum expected duration of time (in years) to close on the sale of business from the date of the acquisition |  | 1 year |  |  |  |  |

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