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Acquisitions (Pro Forma Summary of All Acquisitions) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
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