Goodwill and Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2024

Goodwill and Intangible Assets Disclosure [Abstract]

Change in Goodwill

Change in goodwill:

	Nine Months Ended September 30,
	2024		2023
January 1	$	10,082.3	$	9,734.3
Acquisitions	751.1		30.6
Noncontrolling interests in acquired businesses	24.4		90.7
Contingent purchase price obligations of acquired businesses	—		170.1
Dispositions	(6.0)		(119.0)
Foreign currency translation	76.2		(17.3)
September 30	$	10,928.0	$	9,889.4

Intangible Assets

Intangible assets:

	September 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	$	1,136.2	$	(629.4)	$	506.8	$	902.6	$	(572.9)	$	329.7
Other purchased and internally    developed software	282.7		(250.1)		32.6		327.9		(290.7)		37.2
Total Intangible Assets	$	1,418.9	$	(879.5)	$	539.4	$	1,230.5	$	(863.6)	$	366.9

Amortization of Intangible Assets

Amortization of intangible assets:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2024		2023		2024		2023
Acquired intangible assets and internally developed    strategic platform assets	$	22.2	$	15.7	$	65.2	$	45.2
Other purchased and internally developed software	4.3		4.6		13.4		13.7
Amortization Expense	$	26.5	$	20.3	$	78.6	$	58.9