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Goodwill - Changes in Carrying Amount of Indefinite-Lived Intangible Assets Excluding Goodwill (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Indefinite-lived Intangible Assets [Line Items] |  |
Indefinite-lived intangible assets (excluding goodwill), net carrying value | $ 62.7 | $ 63.5
Trade Names |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Indefinite-lived intangible assets (excluding goodwill), net carrying value | $ 62.7 | $ 63.5

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
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Balance Type: |
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