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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 | Dec. 31, 2024 | Dec. 31, 2023
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Amortizable intangible assets: |  |  |
Amortizable intangible assets, Gross Carrying Amounts |  | $ 1,068.4 | $ 950.1
Amortizable intangible assets, Accumulated Amortization |  | (415.5) | (385.0)
Amortizable intangible assets, Net Book Value |  | 652.9 | 565.1
Total identifiable intangibles |  |  |
Total identifiable intangible assets, Gross Carrying Amounts |  | 1,169.6 | 1,245.2
Total identifiable intangibles, Accumulated Amortization |  | (460.0) | (429.5)
Total identifiable intangibles, Net Book Value |  | 709.6 | 815.7
Trade Names |  |  |
Amortizable intangible assets: |  |  |
Amortizable intangible assets, Gross Carrying Amounts | [1] | 627.5 | 497.1
Amortizable intangible assets, Accumulated Amortization | [1] | (157.5) | (142.0)
Amortizable intangible assets, Net Book Value | [1] | 470.0 | 355.1
Customer and contractual relationships |  |  |
Amortizable intangible assets: |  |  |
Amortizable intangible assets, Gross Carrying Amounts |  | 350.7 | 362.4
Amortizable intangible assets, Accumulated Amortization |  | (230.0) | (221.3)
Amortizable intangible assets, Net Book Value |  | 120.7 | 141.1
Vendor Relationships |  |  |
Amortizable intangible assets: |  |  |
Amortizable intangible assets, Gross Carrying Amounts |  | 82.4 | 82.4
Amortizable intangible assets, Accumulated Amortization |  | (22.2) | (16.7)
Amortizable intangible assets, Net Book Value |  | 60.2 | 65.7
Patents |  |  |
Amortizable intangible assets: |  |  |
Amortizable intangible assets, Gross Carrying Amounts |  | 7.8 | 8.2
Amortizable intangible assets, Accumulated Amortization |  | (5.8) | (5.0)
Amortizable intangible assets, Net Book Value |  | 2.0 | 3.2
Trade Names |  |  |
Indefinite-lived intangible assets: |  |  |
Indefinite-lived intangible assets, Gross Carrying Amount | [1],[2] | 101.2 | 295.1
Indefinite-lived intangible asset, Accumulated Amortization | [1],[2] | (44.5) | (44.5)
Indefinite-lived intangible assets, Net Book Value | [1],[2] | $ 56.7 | $ 250.6
[1] | Reflects the change of our Five Star® and Swingline® indefinite-lived trade names 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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