Goodwill and Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2024

Goodwill and Intangible Assets Disclosure [Abstract]

Change in Goodwill

Change in goodwill:

	Six Months Ended June 30,
	2024		2023
January 1	$	10,082.3	$	9,734.3
Acquisitions	657.5		3.2
Noncontrolling interests in acquired businesses	10.7		—
Contingent purchase price obligations of acquired businesses	—		3.3
Dispositions	(5.9)		(118.6)
Foreign currency translation	(98.1)		81.2
June 30	$	10,646.5	$	9,703.4

Intangible Assets

Intangible assets:

	June 30, 2024						December 31, 2023
	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	$	1,088.6	$	(598.5)	$	490.1	$	902.6	$	(572.9)	$	329.7
Other purchased and internally developed software	291.4		(258.8)		32.6		327.9		(290.7)		37.2
Total Intangible Assets	$	1,380.0	$	(857.3)	$	522.7	$	1,230.5	$	(863.6)	$	366.9

Amortization of Intangible Assets

Amortization of intangible assets:

	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Acquired intangible assets and internally developed strategic platform assets	$	21.5	$	14.7	$	43.0	$	29.5
Other purchased and internally developed software	4.8		4.6		9.1		9.1
Amortization Expense	$	26.3	$	19.3	$	52.1	$	38.6