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Business Combinations - Pro Forma Information (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Summary of unaudited consolidated pro forma results of operations    
Revenues $ 23,007.7 $ 22,172.6
Income from continuing operations 472.1 622.3
Net income $ 473.3 $ 622.6
Income from continuing operations per diluted common share (in dollars per share) $ 5.55 $ 7.25
Net income per diluted common share (in dollars per share) $ 5.56 $ 7.25