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Goodwill and Other Intangible Assets (Pro Forma Financial Information and Acquisition Results) (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Business Combinations [Abstract] |  |  |
Business combinations, unaudited supplemental pro forma revenue | $ 6,400.0 | $ 7,600.0 | $ 7,400.0
Business combinations, unaudited supplemental pro forma net income | 334.5 | 406.6 | 258.7
Business combinations, consolidated acquisition-related revenue | 229.9 | 188.3 | 154.4
Business combinations, consolidated acquisition-related net income | $ (6.7) | $ (1.4) | $ 1.4

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