Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Reconciliation of information used in computing basic and diluted earnings per share [Abstract]
Loss from continuing operations	$ (30.3)	$ (6.8)	$ (35.0)	$ (19.3)
Earnings (loss) from discontinued operations, net	0.6	(17.8)	2.1	(34.7)
Net loss	$ (29.7)	$ (24.6)	$ (32.9)	$ (54.0)
Basic (loss) earnings per common share:
Income (Loss) from Continuing Operations, Per Basic Share	$ (0.34)	$ (0.08)	$ (0.39)	$ (0.22)
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share	0.01	(0.20)	0.02	(0.39)
Net loss	$ (0.33)	$ (0.28)	$ (0.37)	$ (0.61)
Weighted average shares outstanding	89,361,352	88,652,453	89,168,499	88,594,597
Diluted (loss) earnings per common share:
Income (Loss) from Continuing Operations, Per Diluted Share	$ (0.34)	$ (0.08)	$ (0.39)	$ (0.22)
Loss from discontinued operations, net	0.01	(0.20)	0.02	(0.39)
Net loss	$ (0.33)	$ (0.28)	$ (0.37)	$ (0.61)
Diluted (in shares)	89,361,352	88,652,453	89,168,499	88,594,597
Weighted average number of anti-dilutive shares excluded from the calculation (in shares)	4,446,261	5,855,448	4,245,594	5,579,582