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Discontinued Operations (Details) $ in Millions | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) segment | Dec. 31, 2020 USD ($) segment | Jan. 19, 2021 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Number of reportable segments | segment | 2 |  |
Current assets held for sale | $ 1,068.2 | $ 0.0 |
Current liabilities held for sale | $ 207.4 | $ 0.0 |
MTS Test & Simulation |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Maximum expected duration of time (in years) to close on the sale of business from the date of the acquisition | 1 year |  |
Disposal group, consideration |  |  | $ 750.0
MTS Systems Corporation |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Number of reportable segments | segment |  | 2 |
Contingent consideration | $ 28.7 |  |

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