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Goodwill and Intangible Assets (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Changes in Goodwill          
Goodwill, January 1     $ 10,082.3 $ 9,734.3  
Goodwill, Acquisitions     751.1 30.6  
Goodwill, Noncontrolling interests in acquired businesses     24.4 90.7  
Goodwill, Contingent purchase price obligations of acquired businesses     0.0 170.1  
Goodwill, Dispositions     (6.0) (119.0)  
Goodwill, Foreign currency translation     76.2 (17.3)  
Goodwill, September 30 $ 10,928.0 $ 9,889.4 10,928.0 9,889.4  
Goodwill, impairment losses     0.0 0.0  
Goodwill, accumulated impairment losses 0.0   0.0    
Intangible assets:          
Intangible assets, Gross Carrying Value 1,418.9   1,418.9   $ 1,230.5
Intangible assets, Accumulated Amortization (879.5)   (879.5)   (863.6)
Intangible assets, Net Carrying Value 539.4   539.4   366.9
Amortization of intangible assets 26.5 20.3 78.6 58.9  
Acquired intangible assets and internally developed strategic platform assets          
Intangible assets:          
Intangible assets, Gross Carrying Value 1,136.2   1,136.2   902.6
Intangible assets, Accumulated Amortization (629.4)   (629.4)   (572.9)
Intangible assets, Net Carrying Value 506.8   506.8   329.7
Amortization of intangible assets 22.2 15.7 65.2 45.2  
Other purchased and internally developed software          
Intangible assets:          
Intangible assets, Gross Carrying Value 282.7   282.7   327.9
Intangible assets, Accumulated Amortization (250.1)   (250.1)   (290.7)
Intangible assets, Net Carrying Value 32.6   32.6   $ 37.2
Amortization of intangible assets $ 4.3 $ 4.6 $ 13.4 $ 13.7