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Goodwill and Identifiable Intangible Assets
 9 Months Ended
Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Identifiable Intangible Assets GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS
Goodwill
The following table shows changes in the carrying amount of goodwill from December 31, 2022 to September 30, 2023 by reportable segment:
Performance
Coatings		Mobility
Coatings		Total
Balance at December 31, 2022$1,422.5 $75.5 $1,498.0 
Purchase accounting adjustments and divestitures(0.4)(0.1)(0.5)
Foreign currency translation(12.5)(1.0)(13.5)
Balance at September 30, 2023$1,409.6 $74.4 $1,484.0 
Identifiable Intangible Assets
The following tables summarize the gross carrying amounts and accumulated amortization of identifiable intangible assets by major class:
September 30, 2023Gross Carrying
Amount		Accumulated
Amortization		Net Book
Value		Weighted average
amortization periods (years)
Technology$159.2 $(82.5)$76.7 11.2
Trademarks—indefinite-lived253.5 — 253.5 Indefinite
Trademarks—definite-lived125.2 (56.1)69.1 14.5
Customer relationships1,095.5 (458.2)637.3 19.3
Total$1,633.4 $(596.8)$1,036.6 
During the nine months ended September 30, 2023, we retired fully amortized assets totaling $396.0 million consisting of technology, trademarks, and other intangible assets.
December 31, 2022Gross Carrying
Amount		Accumulated
Amortization		Net Book
Value		Weighted average
amortization periods (years)
Technology$555.2 $(462.3)$92.9 10.3
Trademarks—indefinite-lived255.6 — 255.6 Indefinite
Trademarks—definite-lived126.7 (50.8)75.9 14.5
Customer relationships1,106.7 (418.8)687.9 19.2
Other0.6 (0.6)— 5.0
Total$2,044.8 $(932.5)$1,112.3 
The estimated amortization expense related to the fair value of acquired intangible assets for the remainder of 2023 and each of the succeeding five years is:
Remainder of 2023$20.6 
202481.6 
202581.0 
202680.6 
202779.8 
202866.5