Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Millions	3 Months Ended							9 Months Ended
	Sep. 30, 2021		Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Income tax expense (benefit)	$ 1.2	[1]	$ 1.1	$ 1.1	$ 1.1	$ 0.5	$ (4.0)	$ 3.4	$ (2.4)

[1] Includes a tax expense of $1.2 million and a tax expense of $1.1 million for the three months ended September 30, 2021 and 2020, respectively, and a tax expense of $3.4 million and a tax benefit of $2.4 million for the nine months ended September 30, 2021 and 2020, respectively.