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Goodwill and Identifiable Intangible Assets - Summary of Gross Carrying Value and Accumulated Amortization By Class of Identifiable Intangible Assets (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
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Amortizable intangible assets: |  |  |
Amortizable intangible assets, Gross Carrying Amounts |  | $ 1,087.2 | $ 950.1
Amortizable intangible assets, Accumulated Amortization |  | (400.2) | (385.0)
Amortizable intangible assets, Net Book Value |  | 687.0 | 565.1
Total identifiable intangibles |  |  |
Total identifiable intangible assets, Gross Carrying Amounts |  | 1,188.4 | 1,245.2
Total identifiable intangibles, Accumulated Amortization |  | (444.7) | (429.5)
Total identifiable intangibles, Net Book Value |  | 743.7 | 815.7
Trade Names |  |  |
Amortizable intangible assets: |  |  |
Amortizable intangible assets, Gross Carrying Amounts | [1] | 639.8 | 497.1
Amortizable intangible assets, Accumulated Amortization | [1] | (148.9) | (142.0)
Amortizable intangible assets, Net Book Value | [1] | 490.9 | 355.1
Customer and contractual relationships |  |  |
Amortizable intangible assets: |  |  |
Amortizable intangible assets, Gross Carrying Amounts |  | 357.0 | 362.4
Amortizable intangible assets, Accumulated Amortization |  | (226.4) | (221.3)
Amortizable intangible assets, Net Book Value |  | 130.6 | 141.1
Vendor Relationships |  |  |
Amortizable intangible assets: |  |  |
Amortizable intangible assets, Gross Carrying Amounts |  | 82.4 | 82.4
Amortizable intangible assets, Accumulated Amortization |  | (19.5) | (16.7)
Amortizable intangible assets, Net Book Value |  | 62.9 | 65.7
Patents |  |  |
Amortizable intangible assets: |  |  |
Amortizable intangible assets, Gross Carrying Amounts |  | 8.0 | 8.2
Amortizable intangible assets, Accumulated Amortization |  | (5.4) | (5.0)
Amortizable intangible assets, Net Book Value |  | 2.6 | 3.2
Trade Names |  |  |
Indefinite-lived intangible assets: |  |  |
Indefinite-lived intangible assets, Gross Carrying Amount | [2] | 101.2 | 295.1
Indefinite-lived intangible asset, Accumulated Amortization | [2] | (44.5) | (44.5)
Indefinite-lived intangible assets, Net Book Value | [2] | $ 56.7 | $ 250.6
[1] | Reflects the change of two indefinite-lived trade names from indefinite-lived intangibles to amortizable intangible assets as of June 1, 2024.
[2] | Accumulated amortization prior to the adoption of authoritative guidance on goodwill and other intangible assets, at which time further amortization ceased.

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