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Product Warranty (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Warranty reserve activity:          
Balance at beginning of period $ 270.1 $ 241.7 $ 255.6 $ 230.3  
Acquisitions 0.0 0.0 0.0 0.6  
Accruals for warranties issued during the period 53.4 51.4 104.9 95.4  
Settlements made (in cash or in kind) during the period (38.2) (47.6) (78.1) (88.2)  
Foreign currency translation 11.6 (4.9) 14.5 2.5  
Balance at end of period 296.9 $ 240.6 $ 296.9 $ 240.6  
Product warranty period, minimum, years     1 year    
Product warranty period, maximum, years     4 years    
Product warranty accrual, current 262.2   $ 262.2   $ 223.1
Product warranty accrual, noncurrent $ 34.7   $ 34.7   $ 32.5