Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Millions	3 Months Ended					6 Months Ended
	Jun. 30, 2021		Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Income tax expense (benefit)	$ 1.1	[1]	$ 1.1	$ 0.5	$ (4.0)	$ 2.2	$ (3.5)

[1] Includes a tax expense of $1.1 million and a tax expense of $0.5 million for the three months ended June 30, 2021 and 2020, respectively, and a tax expense of $2.2 million and a tax benefit of $3.5 million for the six months ended June 30, 2021 and 2020, respectively.