Special charges (Details) (Technology Products [Member], USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014
Special Charges [Abstract]
Balance beginning of period		$ 12.1
Charged to expense		7.0
Paid or otherwise settled		(6.2)
Balance end of period	12.9	12.9
Special charges	6.0	8.4
Workforce and Personnel Costs [Member]
Special Charges [Abstract]
Balance beginning of period		7.0
Charged to expense		6.5
Paid or otherwise settled		(5.4)
Balance end of period	8.1	8.1
Other Exit Costs [Member]
Special Charges [Abstract]
Balance beginning of period		5.1
Charged to expense	0.2	0.5
Paid or otherwise settled		(0.8)
Balance end of period	4.8	4.8
Closing of Underperforming Retail Stores [Member]
Special Charges [Abstract]
Special charges		0.2
Facility Closing and Exit from PC Manufacturing Business [Member]
Special Charges [Abstract]
Special charges	0.2	0.2
Legal And Professional Fees [Member]
Special Charges [Abstract]
Special charges	0.4	0.6
Workforce Reductions and Other Exit Costs [Member]
Special Charges [Abstract]
Special charges	5.0	6.5
European Shared Services Center [Member]
Special Charges [Abstract]
Recruitment costs	$ 0.2	$ 0.4