| Goodwill and intangible assets Goodwill and intangible assets deemed to have an indefinite life are not amortized, but are evaluated annually for impairment as part of our annual business planning cycle in the fourth fiscal quarter, or when indicators of a potential impairment are present. The following table sets forth goodwill by segment as of October 1, 2025 and December 31, 2025:
| | | | | | | | | | | | | | | | | | | Batteries & Lights | | Auto Care | | Total | | Balance at October 1, 2025 | $ | 902.7 | | | $ | 148.5 | | | $ | 1,051.2 | | | | | | | | | Cumulative translation adjustment | 0.6 | | | (0.5) | | | 0.1 | | | Balance at December 31, 2025 | $ | 903.3 | | | $ | 148.0 | | | $ | 1,051.3 | |
Total intangible assets at December 31, 2025 were as follows: | | | | | | | | | | | | | | | | | | | | | | | | | Gross Carrying Amount | | Accumulated Amortization | | Accumulated Impairment | | Net Carrying Amount | | Trademarks and trade names | $ | 155.1 | | | $ | (48.6) | | | $ | — | | | $ | 106.5 | | | Customer relationships | 395.0 | | | (199.9) | | | (0.6) | | | 194.5 | | | Patents | 34.6 | | | (23.8) | | | — | | | 10.8 | | | Proprietary technology | 172.5 | | | (139.4) | | | — | | | 33.1 | | | Proprietary formulas | 29.2 | | | (18.0) | | | (5.3) | | | 5.9 | | | Total Amortizable intangible assets | 786.4 | | | (429.7) | | | (5.9) | | | 350.8 | | | Trademarks and trade names - indefinite lived | 640.8 | | | — | | | — | | | 640.8 | | | Total Other intangible assets, net | $ | 1,427.2 | | | $ | (429.7) | | | $ | (5.9) | | | $ | 991.6 | |
Total intangible assets at September 30, 2025 were as follows: | | | | | | | | | | | | | | | | | | | | | | | | | Gross Carrying Amount | | Accumulated Amortization | | Accumulated Impairment | | Net Carrying Amount | | Trademarks and trade names | $ | 155.0 | | | $ | (46.4) | | | $ | — | | | $ | 108.6 | | | Customer relationships | 395.0 | | | (193.3) | | | (0.6) | | | 201.1 | | | Patents | 34.5 | | | (23.3) | | | — | | | 11.2 | | | Proprietary technology | 172.5 | | | (135.0) | | | — | | | 37.5 | | | Proprietary formulas | 29.2 | | | (17.6) | | | (5.3) | | | 6.3 | | | Total Amortizable intangible assets | 786.2 | | | (415.6) | | | (5.9) | | | 364.7 | | | Trademarks and trade names - indefinite lived | 640.8 | | | — | | | — | | | 640.8 | | | Total Other intangible assets, net | $ | 1,427.0 | | | $ | (415.6) | | | $ | (5.9) | | | $ | 1,005.5 | |
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