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Acquisitions (Pro Forma Summary of All Acquisitions) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Business Combinations [Abstract] |  |
Revenue | $ 4,463.0 | $ 2,948.2
Net income | $ 160.4 | $ 49.6
Basic net income per share (in dollars per share) | $ 6.02 | $ 2.13
Diluted net income per share (in dollars per share) | $ 5.97 | $ 2.12

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