Summary of Significant Accounting Policies - Goodwill (Details) - reportingUnit	9 Months Ended	12 Months Ended
Sep. 30, 2020	Dec. 31, 2020
Accounting Policies [Abstract]
Number of reporting units	7	7

Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment.

No definition available.

Name:	us-gaap_NumberOfReportingUnits
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration