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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Business Combinations [Abstract] |  |  |  |
Revenue | $ 3,337.1 | $ 3,188.9 | $ 9,557.0 | $ 9,326.8
Net income | $ 85.2 | $ 93.6 | $ 204.0 | $ 205.6
Basic net income per share (in dollars per share) | $ 3.67 | $ 3.87 | $ 8.79 | $ 8.34
Diluted net income per share (in dollars per share) | $ 3.63 | $ 3.86 | $ 8.74 | $ 8.30

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