Commitments and Contingencies (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Other Commitments [Line Items]
Remaining principal balance		$ 22.4		$ 42.4
Payment to ESCO for debt repayment and repurchase of shares		6.2
Repurchase of Class A Common Stock	$ 0.3	3.1	$ 0.3
Class A Common Stock
Other Commitments [Line Items]
Repurchase of Class A Common Stock		2.4
ESCO Notes Payable
Other Commitments [Line Items]
Remaining principal balance		0.0		$ 5.8	$ 5.8
Payment for retirement of debt		$ 3.8