Summary of Significant Accounting Policies, Basis of Presentation (Details)	Dec. 31, 2020
CNA [Member]
Basis of Presentation [Abstract]
Subsidiary ownership percentage	89.60%
Altium Packaging [Member]
Basis of Presentation [Abstract]
Subsidiary ownership percentage	99.00%

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

No definition available.

Name:	us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant