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Goodwill and Identifiable Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Intangible Assets [Line Items] |  |  |
Amortizable intangible assets, Gross Carrying Amounts |  | $ 852.4 | $ 816.9
Amortizable intangible assets, Accumulated Amortization |  | (284.3) | (262.9)
Amortizable intangible assets, Net Book Value |  | 568.1 | 554.0
Total identifiable intangibles, Gross Carrying Amounts |  | 1,276.1 | 1,284.4
Total identifiable intangibles, Accumulated Amortization |  | (328.8) | (307.4)
Total identifiable intangibles, Net Book Value |  | 947.3 | 977.0
Trade Names |  |  |
Intangible Assets [Line Items] |  |  |
Amortizable intangible assets, Gross Carrying Amounts |  | 383.3 | 343.5
Amortizable intangible assets, Accumulated Amortization |  | (104.4) | (97.7)
Amortizable intangible assets, Net Book Value |  | 278.9 | 245.8
Customer and contractual relationships |  |  |
Intangible Assets [Line Items] |  |  |
Amortizable intangible assets, Gross Carrying Amounts |  | 372.6 | 376.8
Amortizable intangible assets, Accumulated Amortization |  | (174.2) | (162.9)
Amortizable intangible assets, Net Book Value |  | 198.4 | 213.9
Vendor Relationships |  |  |
Intangible Assets [Line Items] |  |  |
Amortizable intangible assets, Gross Carrying Amounts |  | 87.7 | 87.7
Amortizable intangible assets, Accumulated Amortization |  | (3.2) | (0.2)
Amortizable intangible assets, Net Book Value |  | 84.5 | 87.5
Patents |  |  |
Intangible Assets [Line Items] |  |  |
Amortizable intangible assets, Gross Carrying Amounts |  | 8.8 | 8.9
Amortizable intangible assets, Accumulated Amortization |  | (2.5) | (2.1)
Amortizable intangible assets, Net Book Value |  | 6.3 | 6.8
Trade Names |  |  |
Intangible Assets [Line Items] |  |  |
Indefinite-lived intangible assets, gross carrying amount |  | 423.7 | 467.5
Indefinite lived intangible asset accumulated amortization prior to the adoption of authoritative guidance | [1] | (44.5) | (44.5)
Indefinite-lived intangible assets, Net Book Value |  | $ 379.2 | $ 423.0
[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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