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Product Warranty (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Warranty reserve activity:          
Balance at beginning of period $ 305.0 $ 266.4 $ 294.9 $ 256.9  
Accruals for warranties issued during the period 43.3 66.2 98.9 109.5  
Settlements made (in cash or in kind) during the period (44.7) (38.6) (90.8) (67.1)  
Foreign currency translation 0.3 (0.2) 0.9 (5.5)  
Balance at end of period 303.9 293.8 303.9 293.8  
Product warranty period, minimum, years     1 year    
Product warranty period, maximum, years     4 years    
Product warranty accrual, current 262.6   262.6   255.9
Product warranty accrual, noncurrent $ 41.3   $ 41.3   $ 39.0