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Acquisitions (Pro Forma Summary of All Acquisitions) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Business Combinations [Abstract] |  |  |  |
Revenue | $ 3,242.2 | $ 3,157.7 | $ 6,142.0 | $ 6,061.6
Net income | $ 62.0 | $ 60.9 | $ 118.6 | $ 111.8
Basic net income per share (in dollars per share) | $ 2.65 | $ 2.46 | $ 5.11 | $ 4.48
Diluted net income per share (in dollars per share) | $ 2.64 | $ 2.45 | $ 5.09 | $ 4.47

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