Discontinued Operations - Narrative (Details) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	May 14, 2020
Segment Reporting Information [Line Items]
(Loss) gain on sale of discontinued operations, net of taxes	$ (300,000)		$ 0	$ 3,300,000	$ 0
Discontinued Operations, Disposed of by Sale [Member] | ASC [Member]
Segment Reporting Information [Line Items]
Cash consideration						$ 258,300,000
Amount held in escrow	1,100,000			1,100,000
(Loss) gain on sale of discontinued operations, net of taxes	(300,000)	$ 3,600,000	0	3,300,000	0
Interest expense	$ 0		$ 1,600,000	$ 2,000,000.0	$ 4,600,000