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Basis of Presentation, Summary of Significant Accounting Policies and Change in Accounting Principles - Goodwill (Details) - reportingUnit |  | 1 Months Ended | 6 Months Ended
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Oct. 31, 2020 | May 31, 2020 | Jun. 30, 2021
Accounting Policies [Abstract] |  |  |
Number of reporting units for goodwill testing | 2 | 2 | 3

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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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