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Goodwill - Changes in Carrying Amount of Indefinite-Lived Intangible Assets Excluding Goodwill (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Indefinite-lived Intangible Assets [Line Items] |  |
Indefinite-lived intangible assets (excluding goodwill), net carrying value | $ 63.5 | $ 8.8
Trade Names |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Indefinite-lived intangible assets (excluding goodwill), net carrying value | $ 63.5 | $ 8.8

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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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- Definition Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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- Details
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