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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, 2022 | Dec. 31, 2021
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Amortizable intangible assets: |  |  |
Amortizable intangible assets, Gross Carrying Amounts |  | $ 816.4 | $ 830.7
Amortizable intangible assets, Accumulated Amortization |  | (315.5) | (301.6)
Amortizable intangible assets, Net Book Value |  | 500.9 | 529.1
Total identifiable intangibles |  |  |
Total identifiable intangible assets, Gross Carrying Amounts |  | 1,224.6 | 1,248.3
Total identifiable intangibles, Accumulated Amortization |  | (360.0) | (346.1)
Total identifiable intangibles, Net Book Value |  | 864.6 | 902.2
Trade Names |  |  |
Amortizable intangible assets: |  |  |
Amortizable intangible assets, Gross Carrying Amounts |  | 370.5 | 373.2
Amortizable intangible assets, Accumulated Amortization |  | (116.3) | (110.5)
Amortizable intangible assets, Net Book Value |  | 254.2 | 262.7
Customer and contractual relationships |  |  |
Amortizable intangible assets: |  |  |
Amortizable intangible assets, Gross Carrying Amounts |  | 355.5 | 366.5
Amortizable intangible assets, Accumulated Amortization |  | (187.5) | (182.4)
Amortizable intangible assets, Net Book Value |  | 168.0 | 184.1
Vendor Relationships |  |  |
Amortizable intangible assets: |  |  |
Amortizable intangible assets, Gross Carrying Amounts |  | 82.4 | 82.4
Amortizable intangible assets, Accumulated Amortization |  | (8.5) | (5.7)
Amortizable intangible assets, Net Book Value |  | 73.9 | 76.7
Patents |  |  |
Amortizable intangible assets: |  |  |
Amortizable intangible assets, Gross Carrying Amounts |  | 8.0 | 8.6
Amortizable intangible assets, Accumulated Amortization |  | (3.2) | (3.0)
Amortizable intangible assets, Net Book Value |  | 4.8 | 5.6
Trade Names |  |  |
Indefinite-lived intangible assets: |  |  |
Indefinite-lived intangible assets, Gross Carrying Amount | [1] | 408.2 | 417.6
Indefinite-lived intangible asset, Accumulated Amortization | [1] | (44.5) | (44.5)
Indefinite-lived intangible assets, Net Book Value | [1] | $ 363.7 | $ 373.1
[1] | 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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