Commitments and Contingencies - Narrative - Environmental Reserves and Estimated Recoveries (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)
Site Contingency [Line Items]
Environmental remediation cost expected period (years)	15 years
Estimated non-reimbursable costs (percentage)	12.00%
Northrop
Site Contingency [Line Items]
Recoverable percentage of costs (percentage)	88.00%
Current annual billing limitation	$ 6.0
Total reimbursable costs under the Northrop Agreement	$ 189.7