Goodwill (Tables)

3 Months Ended

Mar. 31, 2021

Goodwill And Intangible Assets Disclosure [Abstract]

Summary of Goodwill Activity

The following table summarizes goodwill activity for the three-month periods ended March 31, 2021 and 2020 (in millions):

			Accumulated			Goodwill,
	Goodwill		Impairments			Net
Balance at January 1, 2020	$	21.3	$	(11.8	)	$	9.5
Impairment		—		(9.5	)		(9.5	)
Balance at March 31, 2020	$	21.3	$	(21.3	)	$	—
Balance at January 1, 2021		21.3		(21.3	)		—
No activity in 2021		—		—			—
Balance at March 31, 2021	$	21.3	$	(21.3	)	$	—