Basic and Diluted Net Loss Per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net loss
Net loss from continuing operations	$ (72.4)	$ (12.4)	$ (117.4)	$ (24.7)
Net loss from discontinued operations	0	(0.6)	0	(1.5)
Net loss	$ (72.4)	$ (13.0)	$ (117.4)	$ (26.2)
Weighted average number of shares used in per share calculations:
Basic shares	84.4	85.0	84.4	84.8
Diluted shares	84.4	85.0	84.4	84.8
Basic net loss per share:
Continuing operations	$ (0.86)	$ (0.14)	$ (1.39)	$ (0.29)
Discontinued operations	$ 0.00	$ (0.01)	$ 0.00	$ (0.02)
Total basic net loss per share	$ (0.86)	$ (0.15)	$ (1.39)	$ (0.31)
Continuing operations	$ (0.86)	$ (0.14)	$ (1.39)	$ (0.29)
Discontinued operations	$ 0.00	$ (0.01)	$ 0.00	$ (0.02)
Total diluted net loss per share	$ (0.86)	$ (0.15)	$ (1.39)	$ (0.31)