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Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Reconciliation of information used in computing basic and diluted earnings per share [Abstract]
Earnings (loss) from continuing operations	$ 4.4	$ (30.9)	$ 4.0	$ (35.9)
Earnings from discontinued operations, net	0.2	1.2	0.3	3.0
Net earnings (loss)	$ 4.6	$ (29.7)	$ 4.3	$ (32.9)
Basic earnings (loss) per common share:
Earnings (loss) from continuing operations, per basic share	$ 0.05	$ (0.35)	$ 0.04	$ (0.40)
Earnings from discontinued operations, per basic share	0.00	0.02	0.01	0.03
Net earnings (loss) per share, basic	$ 0.05	$ (0.33)	$ 0.05	$ (0.37)
Weighted average shares outstanding	90,063,089	89,361,352	89,893,557	89,168,499
Diluted earnings (loss) per common share:
Earnings (loss) from continuing operations, per diluted share	$ 0.05	$ (0.35)	$ 0.04	$ (0.40)
Loss from discontinued operations, net	0.00	0.02	0.01	0.03
Net earnings (loss) per share, diluted	$ 0.05	$ (0.33)	$ 0.05	$ (0.37)
Diluted (in shares)	90,731,760	89,361,352	90,718,298	89,168,499
Weighted average number of anti-dilutive shares excluded from the calculation (in shares)	6,277,283	4,446,261	5,892,564	4,245,594

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