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Goodwill and Intangible Assets
 12 Months Ended
Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets
Change in goodwill:
December 31,
20232022
January 1$9,734.3 $9,738.6 
Acquisitions51.7 211.7 
Noncontrolling interests in acquired businesses128.6 48.0 
Contingent purchase price obligations of acquired businesses159.7 8.7 
Dispositions(120.6)(19.6)
Foreign currency translation128.6 (253.1)
December 31
$10,082.3 $9,734.3 
There were no goodwill impairment losses recorded in 2023 or 2022, and there are no accumulated goodwill impairment losses.
Intangible assets:
December 31,
 20232022
Gross
Carrying
Value		Accumulated
Amortization		Net
Carrying
Value		Gross
Carrying
Value		Accumulated
Amortization		Net
Carrying
Value
Purchased and internally
   developed software
$369.1 $(306.6)$62.5 $374.8 $(309.1)$65.7 
Customer related and other861.4 (557.0)304.4 758.5 (510.8)247.7 
Intangible Assets$1,230.5 $(863.6)$366.9 $1,133.3 $(819.9)$313.4