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Acquisitions (Pro Forma Summary of All Acquisitions) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Business Combinations [Abstract] |  |  |  |
Revenue | $ 3,745.3 | $ 3,738.3 | $ 10,000.7 | $ 10,548.8
Net income | $ 160.1 | $ 92.3 | $ 291.9 | $ 220.4
Basic net income per share (in dollars per share) | $ 7.01 | $ 3.97 | $ 12.71 | $ 9.50
Diluted net income per share (in dollars per share) | $ 6.92 | $ 3.94 | $ 12.58 | $ 9.44

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