Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Reconciliation of information used in computing basic and diluted earnings per share [Abstract]
Earnings (loss) from continuing operations	$ 15.4	$ 20.9	$ (19.6)	$ 1.6
Earnings (loss) from discontinued operations, net	0.3	(28.5)	2.4	(63.2)
Net earnings (loss)	$ 15.7	$ (7.6)	$ (17.2)	$ (61.6)
Basic earnings (loss) per common share:
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.17	$ 0.24	$ (0.22)	$ 0.02
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share	0.01	(0.32)	0.03	(0.71)
Net loss	$ 0.18	$ (0.08)	$ (0.19)	$ (0.69)
Weighted average shares outstanding	89,469,996	88,720,888	89,270,103	88,637,001
Diluted earnings (loss) per common share:
Income (Loss) from Continuing Operations, Per Diluted Share	$ 0.17	$ 0.24	$ (0.22)	$ 0.02
Loss from discontinued operations, net	0.00	(0.32)	0.03	(0.71)
Net loss	$ 0.17	$ (0.08)	$ (0.19)	$ (0.69)
Diluted (in shares)	90,373,112	89,317,806	89,270,103	88,997,050
Weighted average number of anti-dilutive shares excluded from the calculation (in shares)	4,092,338	5,227,427	5,067,013	5,449,342