Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended				12 Months Ended	93 Months Ended	114 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2020	Mar. 31, 2019	Dec. 31, 2020
Commitments and Contingencies [Line Items]
Purchase commitment, due in next twelve months					$ 44.2		$ 44.2
Long-term purchase commitments					$ 0.9
Minimum
Commitments and Contingencies [Line Items]
Length of purchase commitments, in days					60 days
Maximum
Commitments and Contingencies [Line Items]
Length of purchase commitments, in days					120 days
Government Contract
Commitments and Contingencies [Line Items]
Charges to income from price adjustment clauses		$ 0.6	$ 5.8	$ 4.8
Imputed interest related to price adjustment clauses	$ 0.2		0.7	0.5
Total estimated liability				$ 5.3	$ 12.3		12.3
Reduction in sales		$ 0.6	5.8
Estimated aggregate overcharge in contracts						$ 10.6	$ 11.2
Imputed interest reduction	$ 0.7
Other Expense | Government Contract
Commitments and Contingencies [Line Items]
Total estimated liability			$ 6.5