Earnings (Loss) Per Share - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator:
Net income (loss)	$ (15.3)	$ (19.9)	$ (11.9)	$ 3.5	$ (35.2)	$ (8.4)
Denominator:
Weighted average shares outstanding, basic (in shares)	45.0		44.8		44.9	44.7
Weighted average shares outstanding, diluted (in shares)	45.0		44.8		44.9	44.7
Basic earnings (loss) per share	$ (0.34)		$ (0.27)		$ (0.78)	$ (0.19)
Diluted earnings (loss) per share	$ (0.34)		$ (0.27)		$ (0.78)	$ (0.19)