(Loss) Earnings per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Numerator:
Loss from continuing operations	$ (14.7)	$ (15.5)
Income (loss) from discontinued operations	(76.4)	1.1
Net loss	$ (91.1)	$ (14.4)
Denominator:
Weighted average number of common shares outstanding during the period - basic (in shares)	37.1	41.0
Dilutive effect of stock-based compensation plans (in shares)	0.0	0.0
Weighted average number of diluted shares outstanding during the period - diluted (in shares)	37.1	41.0
Loss per common share — basic:
Continuing operations (in dollars per share)	$ (0.40)	$ (0.38)
Discontinued operations (in dollars per share)	(2.06)	0.03
Net loss (in dollars per share)	(2.46)	(0.35)
Loss per common share — diluted:
Continuing operations (in dollars per share)	(0.40)	(0.38)
Discontinued operations (in dollars per share)	(2.06)	0.03
Net loss (dollars per share)	$ (2.46)	$ (0.35)
Anti-dilutive shares excluded from calculation (in shares)	5.1	4.4