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Product Warranty (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Warranty reserve activity:          
Balance at beginning of period $ 252.9 $ 305.0 $ 284.6 $ 294.9  
Accruals for warranties issued during the period 43.3 43.3 77.3 98.9  
Settlements made (in cash or in kind) during the period (42.2) (44.7) (87.1) (90.8)  
Foreign currency translation 7.3 0.3 (13.5) 0.9  
Balance at end of period 261.3 $ 303.9 $ 261.3 $ 303.9  
Product warranty period, minimum, years     1 year    
Product warranty period, maximum, years     4 years    
Product warranty accrual, current 221.8   $ 221.8   $ 245.7
Product warranty accrual, noncurrent $ 39.5   $ 39.5   $ 38.9