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Summary of Accounting Policies Summary of Accounting Policies - Goodwill and Other Intangible Assets (Details) | 12 Months Ended
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Dec. 31, 2020 reporting_unit
Accounting Policies [Abstract] |
Number of reporting units | 4

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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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