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Acquisitions Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Number of businesses acquired | 0 | 4 |
Goodwill and intangible assets related to acquisitions |  | $ 28.0 | $ 7.6
Interest income | $ 29.7 | $ 29.5 | $ 34.5
IAN |  |  |
Number of businesses acquired |  | 3 | 1
DXTRA |  |  |
Number of businesses acquired |  | 1 |

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