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Product Warranty (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Warranty reserve activity:          
Balance at beginning of period $ 325.8 $ 270.1 $ 316.0 $ 255.6  
Accruals for warranties issued during the period 50.2 53.4 108.7 104.9  
Settlements made (in cash or in kind) during the period (34.1) (38.2) (90.0) (78.1)  
Foreign currency translation (17.1) 11.6 (9.9) 14.5  
Balance at end of period 324.8 $ 296.9 $ 324.8 $ 296.9  
Product warranty period, minimum, years     1 year    
Product warranty period, maximum, years     4 years    
Product warranty accrual, current 281.0   $ 281.0   $ 273.6
Product warranty accrual, noncurrent $ 43.8   $ 43.8   $ 42.4