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Goodwill and Other Intangible Assets
 12 Months Ended
Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets
8.Goodwill and Other Intangible Assets
The changes in the net carrying value of goodwill by reportable segment for the years ended December 31, 2023 and 2022 are as follows:
Sealing
Technologies		Advanced
Surface Technologies		Total
 (in millions)
Goodwill as of December 31, 2021$279.4 $668.6 $948.0 
Foreign currency translation(2.6)(10.9)(13.5)
Acquisition— 0.5 0.5 
Disposition(6.0)— (6.0)
Impairment— (65.2)(65.2)
Goodwill as of December 31, 2022270.8 593.0 863.8 
Foreign currency translation5.4 — 5.4 
Impairment— (60.8)$(60.8)
Goodwill as of December 31, 2023$276.2 $532.2 $808.4 

The goodwill balances reflected above are net of accumulated impairment losses of $27.8 million for the Sealing Technologies segment as of December 31, 2023, 2022 and 2021 and $126.0 million and $65.2 million for the Advanced Surface Technologies segment as of December 31, 2023 and 2022, respectively.
Identifiable intangible assets are as follows:
 As of December 31, 2023As of December 31, 2022
 Gross
Carrying
Amount		Accumulated
Amortization		Gross
Carrying
Amount		Accumulated
Amortization
 (in millions)
Amortized:
Customer relationships$486.6 $184.8 $484.5 $157.6 
Existing technology465.2 106.1 463.7 71.3 
Trademarks64.9 29.6 64.8 24.0 
Other27.4 20.9 36.4 27.3 
1,044.1 341.4 1,049.4 280.2 
Indefinite-Lived:
Trademarks30.8 — 30.6 — 
Total$1,074.9 $341.4 $1,080.0 $280.2 

Amortization expense for the years ended December 31, 2023, 2022 and 2021 was $69.3 million, $76.8 million and $44.3 million, respectively.
The estimated amortization expense for definite-lived (amortized) intangible assets for the next five years is as follows (in millions):
2024$69.1 
2025$68.1 
2026$64.5 
2027$64.0 
2028$63.4