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Goodwill and Other Identifiable Intangible Assets - Detail of Identifiable Intangible Assets (Detail) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Acquired Intangible Assets By Major Class [Line Items] |  |
Cost | $ 472.2 | $ 433.7
Accumulated amortization | (293.1) | (316.7)
Net | 179.1 | 117.0
Net, indefinite-life intangibles | 175.1 | 159.3
Cost | 647.3 | 593.0
Net | 354.2 | 276.3
Customer relationships |  |
Acquired Intangible Assets By Major Class [Line Items] |  |
Cost | 422.6 | 347.1
Accumulated amortization | (258.3) | (247.9)
Net | 164.3 | 99.2
Trade names intangibles |  |
Acquired Intangible Assets By Major Class [Line Items] |  |
Cost | 0.0 | 0.4
Accumulated amortization | 0.0 | (0.4)
Net | 0.0 | 0.0
Patented Technology [Member] |  |
Acquired Intangible Assets By Major Class [Line Items] |  |
Cost | 49.6 | 86.2
Accumulated amortization | (34.8) | (68.4)
Net | $ 14.8 | $ 17.8

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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