Special Charges (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) Store	Sep. 30, 2015 USD ($)
Restructuring Cost and Reserve [Line Items]
Special charges	$ 1.7	$ 0.6	$ 3.6	$ 26.4
Proceeds from partial restitution settlement	(1.3)
Proceeds from the sale of fixed assets			0.6	$ 1.3
NATG and EMEA Technology Products Group [Member]
Restructuring Cost and Reserve [Line Items]
Balance beginning of period			19.3
Charged to expense			18.8
Paid or otherwise settled			(14.8)
Balance end of period	23.3		23.3
Special charges	1.4		12.6
NATG and EMEA Technology Products Group [Member] | Continuing Operations [Member]
Restructuring Cost and Reserve [Line Items]
Special charges	1.7		3.6
NATG and EMEA Technology Products Group [Member] | Discontinued Operations [Member]
Restructuring Cost and Reserve [Line Items]
Special charges	(0.3)		9.0
EMEA Technology Products Group [Member]
Restructuring Cost and Reserve [Line Items]
Special charges	1.7		1.7
Lease termination costs			1.0
Benefit related to rent accruals			(0.3)
Charges related to write off of inventory and fixed assets			0.1
NATG [Member]
Restructuring Cost and Reserve [Line Items]
Special charges			10.9
Lease termination costs	1.0		10.8
Benefit related to rent accruals			(3.3)
Proceeds from partial restitution settlement	(1.3)		(1.3)
Proceeds from the sale of fixed assets	0.5		$ 0.5
Number of retail stores closed | Store			2
Settlement of vendor obligations			$ (1.1)
NATG [Member] | Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Additional wind down costs			1.0
NATG [Member] | Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Additional wind down costs			2.0
NATG [Member] | Continuing Operations [Member]
Restructuring Cost and Reserve [Line Items]
Special charges			1.9
NATG [Member] | Discontinued Operations [Member]
Restructuring Cost and Reserve [Line Items]
Special charges			9.0
Special benefits	0.3
NATG [Member] | Consumer Customer Lists [Member]
Restructuring Cost and Reserve [Line Items]
Cash received for consumer customer list			0.4
Workforce Reductions and Personnel Costs [Member] | EMEA Technology Products Group [Member]
Restructuring Cost and Reserve [Line Items]
Balance beginning of period			0.3
Charged to expense			0.0
Paid or otherwise settled			(0.3)
Balance end of period	0.0		0.0
Lease Liabilities and Other Costs [Member] | EMEA Technology Products Group [Member]
Restructuring Cost and Reserve [Line Items]
Balance beginning of period			0.0
Charged to expense			1.9
Paid or otherwise settled			(0.5)
Balance end of period	1.4		1.4
Workforce Reductions [Member] | NATG [Member]
Restructuring Cost and Reserve [Line Items]
Balance beginning of period			2.7
Charged to expense			0.2
Paid or otherwise settled			(2.8)
Balance end of period	0.1		0.1
Lease Liabilities and Other Exit Costs [Member] | NATG [Member]
Restructuring Cost and Reserve [Line Items]
Balance beginning of period			16.3
Charged to expense			16.7
Paid or otherwise settled			(11.2)
Balance end of period	21.8		21.8
Consulting Expenses [Member] | NATG [Member]
Restructuring Cost and Reserve [Line Items]
Special charges			0.6
Professional Costs [Member] | EMEA Technology Products Group [Member]
Restructuring Cost and Reserve [Line Items]
Special charges			0.6
Professional Costs [Member] | NATG [Member]
Restructuring Cost and Reserve [Line Items]
Special charges	$ 0.5		0.7
Severance [Member] | NATG [Member]
Restructuring Cost and Reserve [Line Items]
Special charges			0.2
Additional Lease Termination Costs of Previously Exited Retail Stores [Member] | NATG [Member]
Restructuring Cost and Reserve [Line Items]
Special charges			1.9
Benefit related to rent accruals			$ (0.1)