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Guarantees (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
Notes receivable sales and guarantees
Mar. 31, 2012
Notes receivable sales and guarantees
Dec. 31, 2012
Notes receivable sales and guarantees
Guarantees          
Deferred revenue included in other current and non-current liabilities $ 68.6 $ 67.2      
Amount of residual value guarantees and buyback commitments given by the company 56.8 80.5      
Sale of long term notes receivable to third party financing companies     2.1    
Maximum percent guaranteed by the company for collection of notes to financing companies (as a percent)     100.00%    
Payments related to notes by customers to financing companies     16.4 11.5  
Outstanding balance of notes receivables guaranteed by the company     13.0   27.1
Standard product warranty, low end of range (in months) 12 months        
Standard product warranty, high end of range (in months) 60 months        
Warranty activity          
Balance at beginning of period 101.4 103.7      
Accruals for warranties issued during the period 15.9 57.1      
Settlements made (in cash or in kind) during the period (14.9) (59.9)      
Currency translation (0.9) 0.5      
Balance at end of period $ 101.5 $ 101.4