(Loss) Earnings per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Numerator:
Loss from continuing operations	$ (152.3)	$ (61.4)	$ (184.1)	$ (98.0)
Loss from discontinued operations	0.0	0.0	0.0	(2.3)
Net loss	$ (152.3)	$ (61.4)	$ (184.1)	$ (100.3)
Denominator:
Weighted average number of common shares outstanding during the period - basic (in shares)	41.2	41.2	41.1	41.0
Dilutive effect of stock-based compensation plans (in shares)	0.0	0.0	0.0	0.0
Weighted average number of diluted shares outstanding during the period - diluted (in shares)	41.2	41.2	41.1	41.0
Loss per common share — basic:
Continuing operations (in dollars per share)	$ (3.70)	$ (1.49)	$ (4.48)	$ (2.39)
Discontinued operations (in dollars per share)	0.00	0.00	0.00	(0.06)
Net loss (in dollars per share)	(3.70)	(1.49)	(4.48)	(2.45)
Loss per common share — diluted:
Continuing operations (in dollars per share)	(3.70)	(1.49)	(4.48)	(2.39)
Discontinued operations (in dollars per share)	0.00	0.00	0.00	(0.06)
Net loss (dollars per share)	$ (3.70)	$ (1.49)	$ (4.48)	$ (2.45)
Anti-dilutive shares excluded from calculation (in shares)	3.5	4.4	3.5	4.5