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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions			2 Months Ended	9 Months Ended
	Jul. 09, 2021	Jun. 01, 2021	Mar. 31, 2021	Sep. 28, 2021	Dec. 31, 2020
Subsequent Event [Line Items]
Common stock, par value					$ 0.001
Disposal Group, Including Discontinued Operation, Assets			$ 51.0
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax				$ 57.0
Subsequent Event [Member] \| Restricted Stock [Member] \| Share-based Payment Arrangement, Employee [Member] \| Board of Directors Chairman [Member]
Subsequent Event [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		33,519
Subsequent Event [Member] \| Restricted Stock [Member] \| Share-based Payment Arrangement, Employee [Member] \| Chief Financial Officer [Member]
Subsequent Event [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		12,649
Subsequent Event [Member] \| Restricted Stock [Member] \| Share-based Payment Arrangement, Nonemployee [Member]
Subsequent Event [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		113,840
Common Class A [Member]
Subsequent Event [Line Items]
Common stock, par value			$ 0.01
Common Class B [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Common stock reserved for issuance		1,999,869
Common stock, par value		$ 0.01
SES Holdings [Member]
Subsequent Event [Line Items]
Gain (Loss) on Sale of Derivatives			$ 16.7
SES Holdings [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Common stock, par value	$ 0.01
Business Acquisition, Percentage of Voting Interests Acquired	100.00%
Business Combination, Consideration Transferred	$ 14.0
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	3,600,000