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Business Acquisitions and Disposition (Details) $ in Millions |  | 6 Months Ended |
--- | --- | --- | ---
Mar. 17, 2021 USD ($) | Jun. 30, 2021 USD ($) acquisition | Dec. 31, 2020 USD ($)
Business Acquisition [Line Items] |  |  |
Number of business acquisitions | acquisition |  | 2 |
Goodwill |  | $ 14,430.0 | $ 14,395.2
Sedaru, Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Sale of investment | $ 27.1 |  |
Pretax gain on sale of investment | $ 27.1 |  |
Other acquisitions |  |  |
Business Acquisition [Line Items] |  |  |
Number of business acquisitions | acquisition |  | 2 |
Purchase price |  | $ 15.7 |
Goodwill |  | 10.7 |
Intangible assets acquired |  | 6.7 |
Other acquisitions | Customer related intangibles |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets acquired |  | $ 6.4 |
Weighted average useful life of intangible assets acquired |  | 13 years 9 months 18 days |
Other acquisitions | Technology |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets acquired |  | $ 0.3 |
Weighted average useful life of intangible assets acquired |  | 5 years |

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