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Goodwill and Intangible Assets (Narrative) (Detail) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2023 USD ($) report | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |
Number of reporting units | report | 4 |  |
Intangible assets, net (excluding goodwill) | $ 67.4 | $ 71.7 | $ 78.5
Intangibles with indefinite useful lives | $ 21.6 | $ 21.8 |

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- Definition Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-2 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482686/350-30-45-1 + Details
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