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Financial Instruments (Details Textual) (USD $)
In Millions, unless otherwise specified
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Mar. 31, 2011
Debt Instrument [Line Items]            
Carrying value of the senior unsecured notes due 2018   $ 298.9   $ 298.9   $ 298.7
Schedule of Available-for-sale Securities [Line Items]            
Unrealized loss on available-for-sale auction rate securities   3.4   3.4    
Financial Instruments (Textual) [Abstract]            
Redemption of available-for-sale holdings by issuers of auction rate securities   0.1 0.1 0.5 11.0  
Redemption of trading holdings by Issuers of auction rate securities         5.4  
Guarantee by the federal government for bonds issued by public agencies       97.00%   97.00%
Value of securities exercised under put option agreement 11.2          
Foreign currency forward contracts that closed in a gain position   4.9   4.9   5.8
Foreign currency forward contracts that closed in a loss position   2.1   2.1   3.3
Specific finance receivables fully reserved   0.3   0.3    
Trade finance receivables transferred to financial institutions on a non-recourse basis   49.0 43.4 208.0 172.3  
Finance receivables   129.9   129.9    
Auction Rate Securities [Member]
           
Schedule of Available-for-sale Securities [Line Items]            
Available-for-sale securities in auction rate securities held       29.3   29.8
Fair value of available-for-sale auction rate securities   25.9   25.9   27.2
Forward Contracts [Member]
           
Derivative [Line Items]            
Effect of foreign currency forward contracts   (1.7) 4.7 (7.6) 11.0  
Net effect of foreign currency forward contracts after including gains and losses on foreign currency exposure   (0.6) 0.6 (2.5) (2.0)  
Senior Notes [Member]
           
Debt Instrument [Line Items]            
Fair value of the senior unsecured notes due 2018   353.0   353.0   348.9
Carrying value of the senior unsecured notes due 2018   $ 298.9   $ 298.9   $ 298.7