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Acquisitions - Pro Forma Summary of All Acquisitions (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Business Combinations [Abstract]    
Revenue $ 15,500.9 $ 16,043.4
Net income $ 502.6 $ 321.1
Basic net income per share (in dollars per share) $ 21.10 $ 13.83
Diluted net income per share (in dollars per share) $ 20.87 $ 13.73