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Goodwill and Intangible Assets
 12 Months Ended
Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets
Change in goodwill:
December 31,
20242023
January 1$10,082.3 $9,734.3 
Acquisitions761.2 51.7 
Noncontrolling interests in acquired businesses22.8 128.6 
Contingent purchase price obligations of acquired businesses— 159.7 
Dispositions(6.0)(120.6)
Foreign currency translation(182.9)128.6 
December 31
$10,677.4 $10,082.3 
The increase in goodwill in 2024 is primarily attributable to the acquisition of Flywheel Digital. There were no goodwill impairment losses recorded in 2024 or 2023, and there are no accumulated goodwill impairment losses.
Intangible assets:
December 31,
 20242023
Gross
Carrying
Value		Accumulated
Amortization		Net
Carrying
Value		Gross
Carrying
Value		Accumulated
Amortization		Net
Carrying
Value
Acquired intangible assets and internally
   developed strategic platform assets
$1,096.1 $(606.1)$490.0 $902.6 $(572.9)$329.7 
Other purchased and internally
   developed software
258.3 (226.3)32.0 327.9 (290.7)37.2 
Intangible Assets$1,354.4 $(832.4)$522.0 $1,230.5 $(863.6)$366.9 
The increase in the gross carrying value of acquired intangible assets was primarily related to the $182.6 million of combined customer relationships, intellectual property and trade name for Flywheel Digital.
Amortization of intangible assets:
Year Ended December 31,
202420232022
Acquired intangible assets and internally developed
   strategic platform assets		$87.5 $61.8 $58.8 
Other purchased and internally developed software18.1 18.5 21.5 
Amortization Expense$105.6 $80.3 $80.3