Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Change in goodwill	$ 0	$ 0
Goodwill impairment loss	0	0
Intangible assets amortization expense	$ 1,000,000.0	$ 5,100,000	$ 5,500,000