Earnings Per Share ("EPS") (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net (loss) income	$ 19.3	$ (11.5)	$ 20.0	$ (39.8)
Weighted Average Shares Outstanding:
Basic weighted average shares outstanding (in shares)	47.8	47.7	47.8	47.6
Dilutive effect of stock options and restricted share unit awards (in shares)	0.3	0.0	0.2	0.0
Diluted weighted average shares outstanding (in shares)	48.1	47.7	48.0	47.6
Earnings (Loss) Per Share
Basic (in dollars per share)	$ 0.40	$ (0.24)	$ 0.42	$ (0.84)
Diluted (in dollars per share)	$ 0.40	$ (0.24)	$ 0.42	$ (0.84)
Dilutive securities excluded from computation of earnings per share (in shares)	1.5		1.4