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Product Warranty (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Warranty reserve activity:      
Balance at beginning of period $ 294.9 $ 256.9  
Accruals for warranties issued during the period 55.6 43.3  
Settlements made (in cash or in kind) during the period (46.1) (28.5)  
Foreign currency translation 0.6 (5.3)  
Balance at end of period 305.0 266.4  
Product warranty period, minimum, years 1 year    
Product warranty period, maximum, years 4 years    
Product warranty accrual, current 265.0   255.9
Product warranty accrual, noncurrent $ 40.0   $ 39.0