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Acquisitions (Pro Forma Summary of All Acquisitions) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Business Combinations [Abstract]    
Revenue $ 2,805.5 $ 2,871.8
Net income $ 46.3 $ 56.8
Basic net income per share (in dollars per share) $ 1.99 $ 2.45
Diluted net income per share (in dollars per share) $ 1.97 $ 2.44