Special charges (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013
Industrial Products [Member]
Special Charges [Abstract]
Balance beginning of period		$ 1.8
Charged to expense		0
Paid or otherwise settled		(0.1)
Balance end of period	1.7	1.7
Industrial Products [Member] | Workforce and Personnel Costs [Member]
Special Charges [Abstract]
Balance beginning of period		0.2
Charged to expense		0.1
Paid or otherwise settled		0
Balance end of period	0.3	0.3
Industrial Products [Member] | Other Exit Costs [Member]
Special Charges [Abstract]
Balance beginning of period		1.6
Charged to expense		(0.1)
Paid or otherwise settled		(0.1)
Balance end of period	1.4	1.4
Technology Products [Member]
Special Charges [Abstract]
Balance beginning of period		4.3
Charged to expense		7.2
Paid or otherwise settled		(2.9)
Balance end of period	8.6	8.6
Special charges		10.7
Initial start-up costs	1.1	1.8
Technology Products [Member] | Workforce and Personnel Costs [Member]
Special Charges [Abstract]
Balance beginning of period		4.3
Charged to expense		6.1
Paid or otherwise settled		(2.9)
Balance end of period	7.5	7.5
Special charges	0.3	2.2
Technology Products [Member] | Other Exit Costs [Member]
Special Charges [Abstract]
Balance beginning of period		0
Charged to expense		1.1
Paid or otherwise settled		0
Balance end of period	1.1	1.1
Technology Products [Member] | Closing of Underperforming Retail Stores [Member]
Special Charges [Abstract]
Special charges	1.5	1.5
Technology Products [Member] | Facility Closing and Exit from PC Manufacturing Business [Member]
Special Charges [Abstract]
Restructuring reserve adjustment	0.8	0.6
Technology Products [Member] | Legal And Professional Fees [Member]
Special Charges [Abstract]
Special charges	0.3	0.3
Technology Products [Member] | Workforce Reductions and Other Exit Costs [Member]
Special Charges [Abstract]
Special charges		$ 4.3