Goodwill and Intangible Assets:

The following is a summary of the change in goodwill from December 31, 2018 through March 31, 2019, both in total and as allocated to the Company’s operating segments:



	Insurance			Energy and Specialized Markets		Financial Services			Total
Goodwill, net at December 31, 2018 ⁽¹⁾	$	833.8		$	2,054.7	$	473.0		$	3,361.5
Current period acquisitions		—			32.8		—			32.8
Purchase accounting reclassification		(0.1	)		—		(0.1	)		(0.2	)
Foreign currency translation		7.3			30.2		0.1			37.6
Goodwill, net at March 31, 2019 ⁽¹⁾	$	841.0		$	2,117.7	$	473.0		$	3,431.7

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⁽¹⁾	These balances are net of accumulated impairment charges of $3.2 million that occurred prior to December 31, 2018.

Goodwill and intangible assets with indefinite lives are subject to impairment testing annually as of June 30, or whenever events or changes in circumstances indicate that the carrying amount may not be fully recoverable. Goodwill impairment testing compares the carrying value of each reporting unit to its fair value. If the fair value of the reporting unit exceeds the carrying value of the net assets, including goodwill assigned to that reporting unit, goodwill is not impaired. If the carrying value of the reporting unit’s net assets including goodwill exceeds the fair value of the reporting unit, then the Company will determine the implied fair value of the reporting unit’s goodwill. If the carrying value of a reporting unit’s goodwill exceeds its implied fair value, then an impairment loss is recorded for the difference between the carrying amount and the implied fair value of goodwill. The Company completed the required annual impairment test as of June 30, 2018, and concluded that there was no impairment of goodwill. There were no triggering events for the three months ended March 31, 2019 that would impact the results of the impairment test performed as of June 30, 2018.

The Company’s intangible assets and related accumulated amortization consisted of the following:



	Weighted Average Useful Life	Cost		Accumulated Amortization			Net
March 31, 2019
Technology-based	8 years	$	446.7	$	(266.4	)	$	180.3
Marketing-related	16 years		260.8		(82.2	)		178.6
Contract-based	6 years		5.0		(5.0	)		—
Customer-related	14 years		741.1		(238.9	)		502.2
Database-related	19 years		474.6		(86.7	)		387.9
Total intangible assets		$	1,928.2	$	(679.2	)	$	1,249.0
December 31, 2018
Technology-based	8 years	$	438.8	$	(255.5	)	$	183.3
Marketing-related	16 years		255.8		(77.2	)		178.6
Contract-based	6 years		5.0		(5.0	)		—
Customer-related	14 years		718.2		(223.9	)		494.3
Database-related	19 years		450.5		(78.9	)		371.6
Total intangible assets		$	1,868.3	$	(640.5	)	$	1,227.8

Amortization expense related to intangible assets for the three months ended March 31, 2019 and 2018 was $33.2 million. Estimated amortization expense for the remainder of 2019 and the years through 2023 and thereafter for intangible assets subject to amortization is as follows:



Year	Amount
2019	$	102.6
2020		134.6
2021		124.2
2022		112.6
2023		100.0
2024 and thereafter		675.0
	$	1,249.0