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Goodwill and Identifiable Intangibles (Gross Carrying Amount and Accumulated Amortization) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Amortizable intangible assets:    
Amortizable intangible assets, gross $ 816.9 $ 563.2
Amortizable intangible assets, accumulated amortization (262.9) (227.4)
Amortizable intangible assets, net book value 554.0 335.8
Total identifiable intangible assets, gross 1,284.4 1,030.5
Total identifiable intangibles, accumulated amortization (307.4) (271.9)
Total identifiable intangibles, net book value 977.0 758.6
Trade names    
Amortizable intangible assets:    
Amortizable intangible assets, gross 343.5 316.7
Amortizable intangible assets, accumulated amortization (97.7) (83.7)
Amortizable intangible assets, net book value 245.8 233.0
Customer relationships    
Amortizable intangible assets:    
Amortizable intangible assets, gross 376.8 241.0
Amortizable intangible assets, accumulated amortization (162.9) (142.3)
Amortizable intangible assets, net book value 213.9 98.7
Vendor Relationships    
Amortizable intangible assets:    
Amortizable intangible assets, gross 87.7 0.0
Amortizable intangible assets, accumulated amortization (0.2) 0.0
Amortizable intangible assets, net book value 87.5 0.0
Patents    
Amortizable intangible assets:    
Amortizable intangible assets, gross 8.9 5.5
Amortizable intangible assets, accumulated amortization (2.1) (1.4)
Amortizable intangible assets, net book value 6.8 4.1
Trade names    
Indefinite-lived intangible assets:    
Indefinite-lived intangible assets, gross 467.5 467.3
Indefinite-lived intangible assets, accumulated amortization [1] (44.5) (44.5)
Indefinite-lived intangible assets, net book value $ 423.0 $ 422.8
[1] Accumulated amortization prior to the adoption of authoritative guidance on goodwill and other intangible assets, at which time further amortization ceased.