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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