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Acquisitions (Details) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 09, 2020 USD ($) segment $ / shares | Jan. 31, 2021 USD ($) contract | Jan. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) contract | Dec. 31, 2019 USD ($) item | Dec. 31, 2018 USD ($) contract | Mar. 31, 2020 USD ($)
Acquisitions |  |  |  |  |  |  |  |  |  |
Number of acquisitions | item |  |  |  |  |  |  |  | 9 |  |
Acquisition-related expenses |  |  |  | $ 11.5 | $ 8.9 | $ 16.5 | $ 11.5 | $ 25.4 | $ 8.5 |
Acquisition-related expenses, net of tax |  |  |  | 10.7 | $ 7.8 | $ 13.2 | 10.7 | 21.0 | 7.2 |
Purchase price, net of cash acquired |  |  |  |  |  |  | 50.4 | 937.4 | 158.9 |
Goodwill deductible for tax purposes |  |  |  |  |  |  |  | 455.0 |  |
Goodwill |  |  |  | 5,032.1 |  |  | 5,032.1 | 4,867.1 | 4,103.2 |
Amortization expense |  |  |  |  |  |  | $ 49.6 | 67.3 | 46.9 |
SSI Controls Technologies |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |
Aggregate purchase price, net of cash acquired (subject to post-closing adjustments) |  |  | $ 400.0 |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  |  |  |  | $ 75.0
MTS Systems Corporation |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |
Acquisition price per share | $ / shares | $ 58.50 |  |  |  |  |  |  |  |  |
Number of business segments | segment | 2 |  |  |  |  |  |  |  |  |
Agreed upon Purchase Price, net of cash acquired including assumption of outstanding debt and liabilities | $ 1,700.0 |  |  |  |  |  |  |  |  |
2019 Acquisitions [Member] |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | 784.6 |  |
Definite-lived intangible assets |  |  |  |  |  |  |  | 111.8 |  |
2019 Acquisitions [Member] | Minimum |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |
Useful lives |  |  |  |  |  |  | 5 years |  |  |
2019 Acquisitions [Member] | Maximum |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |
Useful lives |  |  |  |  |  |  | 10 years |  |  |
Backlog |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |
Amortization expense |  |  |  |  |  |  |  | 15.7 |  |
Backlog | SSI Controls Technologies |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |
Amortization expense |  |  |  |  |  |  |  | $ 12.5 |  |
Cable Products and Solutions |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |
Number of acquisitions | item |  |  |  |  |  |  |  | 1 |  |
Goodwill |  |  |  | 157.6 |  |  | $ 157.6 | $ 157.1 | $ 146.5 |
Interconnect Products and Assemblies |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |
Number of acquisitions | contract |  |  |  |  |  |  | 2 |  | 3 |
Purchase price, net of cash acquired |  |  |  |  |  |  | $ 50.4 |  | $ 158.9 |
Goodwill |  |  |  | $ 4,874.5 |  |  | $ 4,874.5 | $ 4,710.0 | $ 3,956.7 |
Subsequent Event | Interconnect Products and Assemblies |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |
Number of acquisitions | contract |  | 2 |  |  |  |  |  |  |  |
Purchase price, net of cash acquired |  | $ 145.0 |  |  |  |  |  |  |  |

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