Discontinued Operations - Financial Results (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	May 14, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net Cash Used In Operating Activities	$ 0	$ (1,400,000)
Net Cash Used In Investing Activities	0	(13,700,000)
Cash Provided by (Used in) Financing Activities, Discontinued Operations	0	15,200,000
Net Cash Provided by (Used in) Discontinued Operations	0	100,000
Income from Discontinued Operations, Net of Taxes	0	(900,000)
Loss from Discontinued Operations, Net of Taxes		(900,000)
ASC [Member] | Discontinued Operations, Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash consideration			$ 258,300,000
Amount held in escrow	1,100,000
Interest expense	1.3
Revenues	0	9,500,000
Operating expense	0	7,100,000
Selling, general and administrative expense	0	2,000,000.0
Total Expenses	0	9,100,000
Other income (expense)	0	(1,500,000)
Loss from Discontinued Operations Before Taxes	0	(1,100,000)
Income tax benefit	0	200,000
Income from Discontinued Operations, Net of Taxes	0	(900,000)
Loss from Discontinued Operations, Net of Taxes	$ 0	$ (900,000)