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Goodwill and Other Intangible Assets
 6 Months Ended
Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets Goodwill and Other Intangible Assets
The carrying value of goodwill by segment was as follows:
Application SoftwareNetwork Software & SystemsMeasurement & Analytical SolutionsProcess TechnologiesTotal
Balances at December 31, 2020$8,802.3 $4,083.1 $1,190.8 $319.0 $14,395.2 
Additions10.7 — — — 10.7 
Other(4.7)0.9 — — (3.8)
Currency translation adjustments7.8 15.9 2.3 1.9 27.9 
Balances at June 30, 2021$8,816.1 $4,099.9 $1,193.1 $320.9 $14,430.0 

Other relates primarily to purchase accounting adjustments for acquisitions.

Other intangible assets were comprised of:
CostAccumulated
amortization		Net book
value
Assets subject to amortization:
Customer related intangibles$7,494.7 $(1,703.8)$5,790.9 
Unpatented technology942.8 (363.9)578.9 
Software172.4 (127.4)45.0 
Patents and other protective rights13.0 (6.7)6.3 
Trade names7.3 (5.6)1.7 
Assets not subject to amortization:
Trade names784.1 — 784.1 
Balances at December 31, 2020$9,414.3 $(2,207.4)$7,206.9 
Assets subject to amortization:
Customer related intangibles$7,508.6 $(1,927.8)$5,580.8 
Unpatented technology934.7 (411.4)523.3 
Software172.5 (134.9)37.6 
Patents and other protective rights13.9 (5.9)8.0 
Trade names7.4 (6.2)1.2 
Assets not subject to amortization:
Trade names785.9 — 785.9 
Balances at June 30, 2021$9,423.0 $(2,486.2)$6,936.8 

Amortization expense of other intangible assets was $290.6 and $200.8 during the six months ended June 30, 2021 and 2020, respectively.

An evaluation of the carrying value of goodwill and indefinite-lived intangibles is required to be performed on an annual basis and on an interim basis if an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying value. There have been no events or changes in circumstances which indicate an interim impairment review is required in 2021. The Company will perform the annual analysis during the fourth quarter of 2021.