Special charges (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Industrial Products [Member]
Special Charges [Abstract]
Balance beginning of period	$ 1.3
Charged to expense	0
Paid or otherwise settled	(0.1)
Balance end of period	1.2
Industrial Products [Member] | Workforce and Personnel Costs [Member]
Special Charges [Abstract]
Balance beginning of period	0.2
Charged to expense	0
Paid or otherwise settled	0
Balance end of period	0.2
Industrial Products [Member] | Other Exit Costs [Member]
Special Charges [Abstract]
Balance beginning of period	1.1
Charged to expense	0
Paid or otherwise settled	(0.1)
Balance end of period	1.0
Technology Products [Member]
Special Charges [Abstract]
Balance beginning of period	12.1
Charged to expense	1.8
Paid or otherwise settled	(3.3)
Balance end of period	10.6
Special charges	2.4
Technology Products [Member] | Workforce and Personnel Costs [Member]
Special Charges [Abstract]
Balance beginning of period	7.0
Charged to expense	1.5
Paid or otherwise settled	(2.8)
Balance end of period	5.7
Technology Products [Member] | Other Exit Costs [Member]
Special Charges [Abstract]
Balance beginning of period	5.1
Charged to expense	0.3
Paid or otherwise settled	(0.5)
Balance end of period	4.9
Technology Products [Member] | Closing of Underperforming Retail Stores [Member]
Special Charges [Abstract]
Special charges	0.2
Technology Products [Member] | Legal And Professional Fees [Member]
Special Charges [Abstract]
Special charges	0.2
Technology Products [Member] | European Shared Services Center [Member]
Special Charges [Abstract]
Recruitment costs	$ 0.2