Special Charges (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) Store	Jun. 30, 2015 USD ($)
Restructuring Cost and Reserve [Line Items]
Special charges	$ 0.3	$ 20.5	$ 1.9	$ 25.8
NATG [Member]
Restructuring Cost and Reserve [Line Items]
Special charges	1.7		11.2
Special charges in continuing operations	0.3		1.9
Special charges discontinued operations	1.4		9.3
Lease termination costs	2.8		$ 9.8
Number of retail stores closed | Store			2
Settlement of vendor obligations	(1.1)		$ (1.1)
Reversal of previously accrued severances	(0.1)
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] | Consumer Customer Lists [Member]
Restructuring Cost and Reserve [Line Items]
Cash received for consumer customer list			0.4
Technology Products [Member]
Restructuring Cost and Reserve [Line Items]
Balance beginning of period			19.3
Charged to expense			15.8
Paid or otherwise settled			(11.7)
Balance end of period	23.4		23.4
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
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			(2.4)
Balance end of period	0.5		0.5
Lease Liabilities and Other Exit Costs [Member] | NATG [Member]
Restructuring Cost and Reserve [Line Items]
Balance beginning of period			16.3
Charged to expense			15.6
Paid or otherwise settled			(9.0)
Balance end of period	22.9		22.9
Consulting Expenses [Member] | NATG [Member]
Restructuring Cost and Reserve [Line Items]
Special charges			0.6
Professional Costs [Member] | NATG [Member]
Restructuring Cost and Reserve [Line Items]
Special charges	$ 0.1		0.2
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