Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Reconciliation of Pretax Profit (Loss) of Discontinued Operations to After-Tax Profit or Loss of Discontinued Operations [Abstract]
Net loss from discontinued operations	$ (0.3)	$ (12.0)	$ (21.9)	$ (30.5)
NATG [Member]
Reconciliation of Pretax Profit (Loss) of Discontinued Operations to After-Tax Profit or Loss of Discontinued Operations [Abstract]
Net sales	0.0	276.0	12.0	835.6
Cost of sales	0.0	257.6	13.4	771.5
Gross profit (loss)	0.0	18.4	(1.4)	64.1
Selling, general & administrative expenses	0.6	28.0	11.7	84.9
Special charges	(0.3)	2.0	9.0	10.0
Operating loss from discontinued operations	(0.3)	(11.6)	(22.1)	(30.8)
Foreign currency exchange (gain) loss	(0.1)	0.2	0.3	(0.6)
Interest and other income, net	0.1	0.0	(0.2)	0.0
Loss from discontinued operations before income taxes	(0.3)	(11.8)	(22.2)	(30.2)
Provision (benefit) for income taxes	0.0	0.2	(0.3)	0.3
Net loss from discontinued operations	$ (0.3)	$ (12.0)	$ (21.9)	$ (30.5)