Special Charges (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Restructuring Cost and Reserve [Line Items]
Special charges	$ 0.0	$ 1.6
Write offs of cumulative translation adjustments	14.4
SARL Business [Member]
Restructuring Cost and Reserve [Line Items]
Vendor guarantees	20.0
SARL Business [Member] | Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Additional charges	0.5
SARL Business [Member] | Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Additional charges	1.0
SARL Business [Member] | Discontinued Operations [Member]
Restructuring Cost and Reserve [Line Items]
Write offs of cumulative translation adjustments	14.4
Net asset write-offs	8.2
Charges related to legal, professional and other costs	0.7
Require use of cash	0.7
NATG [Member] | Germany [Member]
Restructuring Cost and Reserve [Line Items]
Balance beginning of period	20.5
Charged to expense	0.3
Paid or otherwise settled	(1.8)
Balance end of period	19.0
NATG [Member] | Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Additional charges	1.0
NATG [Member] | Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Additional charges	2.0
NATG [Member] | Discontinued Operations [Member]
Restructuring Cost and Reserve [Line Items]
Charged to expense	0.6
Future lease cash flows	0.3
Ongoing restitution proceedings	0.3
NATG and SARL [Member] | Discontinued Operations [Member]
Restructuring Cost and Reserve [Line Items]
Special charges	23.9
Lease Liabilities and Other Costs [Member] | Germany [Member]
Restructuring Cost and Reserve [Line Items]
Balance beginning of period	1.2
Charged to expense	0.0
Paid or otherwise settled	0.0
Balance end of period	1.2
Lease Liabilities and Other Exit Costs [Member] | NATG [Member]
Restructuring Cost and Reserve [Line Items]
Balance beginning of period	19.3
Charged to expense	0.3
Paid or otherwise settled	(1.8)
Balance end of period	$ 17.8