Discontinued Operations (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Reconciliation of Pretax Profit (Loss) of Discontinued Operations to After-Tax Profit or Loss of Discontinued Operations [Abstract]
Net loss from discontinued operations	$ (5.5)		$ (9.7)	$ (34.3)	$ (28.5)
Net loss per share - basic and diluted (in dollars per share)	$ (0.15)		$ (0.26)	$ (0.93)	$ (0.76)
SARL [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on the sale of business		$ 23.3
Loss on sale of net assets		8.2
Translation adjustments		14.4
Legal, professional and other costs	$ 0.3	0.7
Severance and other personnel costs	0.3
Accelerated depreciation charges	0.3
Reconciliation of Pretax Profit (Loss) of Discontinued Operations to After-Tax Profit or Loss of Discontinued Operations [Abstract]
Net sales	0.0		$ 123.0	$ 117.0	$ 278.1
Cost of sales	0.0		109.3	102.9	245.3
Gross profit (loss)	0.0		13.7	14.1	32.8
Selling, distribution & administrative expenses	1.4		22.4	20.0	53.2
Special charges	4.4		1.4	28.3	9.3
Operating loss from discontinued operations	(5.8)		(10.1)	(34.2)	(29.7)
Interest and other income, net	0.2		(0.2)	0.5	(1.1)
Loss from discontinued operations before income taxes	(6.0)		(9.9)	(34.7)	(28.6)
Provision for (benefit from) income taxes	(0.5)		(0.2)	(0.4)	(0.1)
Net loss from discontinued operations	$ (5.5)		$ (9.7)	$ (34.3)	$ (28.5)
Net loss per share - basic and diluted (in dollars per share)	$ (0.15)		$ (0.26)	$ (0.93)	$ (0.76)
NATG [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Special charges related to future lease cash flows	$ 3.2	0.3
Professional costs related to ongoing restitution proceedings	0.3	$ 0.3
Reconciliation of Pretax Profit (Loss) of Discontinued Operations to After-Tax Profit or Loss of Discontinued Operations [Abstract]
Net sales	0.0		$ (0.1)	$ 0.0	$ 12.0
Net loss from discontinued operations	$ 4.2		$ 5.4	$ 6.1	$ 21.6