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Summary of Significant Accounting Policies - Goodwill and Indefinite-Lived Intangibles (Details) | 12 Months Ended
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Dec. 31, 2017 number
Annual Goodwill Impairment Assessment [Abstract] |
Number of Reporting Units | 7
Number of reporting units that have goodwill | 5
Number of Reportable Segments | 4

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- Definition Goodwill Impairment Assessment [Abstract] + References No definition available. + Details
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- Definition Number of reporting units that have goodwill + References No definition available. + Details
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Balance Type: | na
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment. + References No definition available. + Details
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