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Goodwill and Other Intangible Assets (Pro Forma Financial Information and Acquisition Results) (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Pro Forma Financial Information and Acquisition Results [Abstract] |  |  |  |
Business combinations, unaudited supplemental pro forma revenue | $ 2,000.0 | $ 1,900.0 | $ 4,000.0 | $ 3,600.0
Business combinations, unaudited supplemental pro forma net income (loss) | 81.6 | 58.6 | 151.2 | 95.5
Business combinations, consolidated acquisition-related revenue | 271.4 | 63.5 | 358.2 | 113.0
Business combinations, consolidated acquisition-related income (loss) | $ 3.5 | $ 0.4 | $ 4.7 | $ (0.5)

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