Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Numerator:
Net income	$ 2.6	$ 5.5	$ 78.4	$ 42.0
Denominator:
Denominator for basic earnings per share — weighted average shares	35.5	35.4	35.5	35.3
Effect of dilutive securities:
Equity compensation plans	0.5	0.6	0.5	0.6
Weighted-average shares outstanding - diluted	36.0	36.0	36.0	35.9
Basic earnings per share from consolidated operations (in dollars per share)	$ 0.07	$ 0.16	$ 2.21	$ 1.19
Diluted earnings per share (in dollars per share)	$ 0.07	$ 0.15	$ 2.18	$ 1.17