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Goodwill and Other Intangible Assets - Pro Forma Financial Information and Acquisition Results - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Pro Forma Financial Information and Acquisition Results [Abstract] |  |  |  |
Business combinations, unaudited supplemental pro forma revenue | $ 2,400.0 | $ 2,000.0 | $ 6,400.0 | $ 5,600.0
Business combinations, unaudited supplemental pro forma net income (loss) | 115.5 | 127.2 | 266.6 | 222.5
Business combinations, consolidated acquisition-related revenue | 344.4 | 69.3 | 702.7 | 182.4
Business combinations, consolidated acquisition-related income (loss) | $ (6.6) | $ (4.3) | $ (1.3) | $ (5.0)

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