
(in millions)	Index		Analytics		Sustainability and Climate		All Other - Private Assets		Total
Goodwill at December 31, 2025	$	1,231.1	$	296.9	$	86.3	$	1,309.1	$	2,923.4
Acquisitions1	42.4		—		—		11.6		54.0
Foreign exchange translation adjustment	(2.3)		—		(0.5)		(0.4)		(3.2)
Goodwill at June 30, 2026	$	1,271.2	$	296.9	$	85.8	$	1,320.3	$	2,974.2

The following table presents the amount of amortization expense related to intangible assets by category for the periods indicated:


	Three Months Ended June 30,				Six Months Ended June 30,
(in millions)	2026		2025		2026		2025
Amortization expense of acquired intangible assets	$	20.9	$	24.2	$	40.5	$	50.0
Amortization expense of internally developed capitalized software	22.9		19.5		45.2		37.6
Total amortization of intangible assets expense	$	43.8	$	43.7	$	85.7	$	87.6

The gross carrying and accumulated amortization amounts related to the Company’s intangible assets were as follows:


	June 30, 2026						December 31, 2025
(in millions)	Gross intangible assets		Accumulated amortization		Net intangible assets		Gross intangible assets		Accumulated amortization		Net intangible assets
Customer relationships	$	723.0	$	(416.1)	$	306.9	$	716.2	$	(406.7)	$	309.5
Proprietary data	470.2		(167.0)		303.2		455.6		(147.5)		308.1
Acquired technology and software	285.9		(222.5)		63.4		258.2		(213.7)		44.5
Trademarks	209.1		(192.0)		17.1		209.1		(189.9)		19.2
Internally developed capitalized software	465.7		(300.4)		165.3		407.7		(256.5)		151.2
Total	$	2,153.9	$	(1,298.0)	$	855.9	$	2,046.8	$	(1,214.3)	$	832.5

The following table presents the estimated amortization expense for the remainder of the year ending December 31, 2026 and succeeding years:


Years Ending December 31, (in millions)	Amortization Expense
Remainder of 2026	$	85.9
2027	147.6
2028	116.7
2029	84.7
2030	73.4
Thereafter	347.6
Total	$	855.9