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Acquisitions Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Goodwill and intangible assets related to acquisitions | $ 28.0 | $ 7.6 | $ 2,131.0
Number of businesses acquired | 4 | 1 | 5
Interest income | $ 29.5 | $ 34.5 | $ 21.8
IAN |  |  |
Number of businesses acquired | 3 |  | 2
DXTRA |  |  |
Number of businesses acquired | 1 |  | 3

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