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Special charges (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Industrial Products [Member]
    
Special Charges [Abstract]    
Balance beginning of period   $ 1.8
Charged to expense   0
Paid or otherwise settled   (0.2)
Balance end of period 1.6 1.6
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   (0.1)
Balance end of period 0.2 0.2
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   12.3
Paid or otherwise settled   (3.6)
Balance end of period 13.0 13.0
Special charges   16.5
Technology Products [Member] | Workforce and Personnel Costs [Member]
    
Special Charges [Abstract]    
Balance beginning of period   4.3
Charged to expense   6.3
Paid or otherwise settled   (3.4)
Balance end of period 7.2 7.2
Special charges 0.2 2.2
Technology Products [Member] | Other Exit Costs [Member]
    
Special Charges [Abstract]    
Balance beginning of period   0
Charged to expense   6.0
Paid or otherwise settled   (0.2)
Balance end of period 5.8 5.8
Technology Products [Member] | Closing of Underperforming Retail Stores [Member]
    
Special Charges [Abstract]    
Lease termination costs 3.8 4.8
Fixed asset write-offs 1.5 2.0
Technology Products [Member] | Legal And Professional Fees [Member]
    
Special Charges [Abstract]    
Special charges 0.2 0.5
Technology Products [Member] | Workforce Reductions and Other Exit Costs [Member]
    
Special Charges [Abstract]    
Special charges   4.5
Technology Products [Member] | European Shared Services Center [Member]
    
Special Charges [Abstract]    
Restructuring reserve adjustment   0.6
Initial start-up costs   1.8
Recruitment costs $ 0.1 $ 0.1