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Product Warranty (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Warranty reserve activity:          
Balance at beginning of period $ 371.9 $ 324.8 $ 360.9 $ 316.0  
Accruals for warranties issued during the period 46.8 55.6 145.9 164.3  
Settlements made (in cash or in kind) during the period (46.0) (49.7) (133.6) (139.7)  
Foreign currency translation (13.3) (0.7) (13.8) (10.6)  
Balance at end of period 359.4 $ 330.0 $ 359.4 $ 330.0  
Product warranty period, minimum, years     1 year    
Product warranty period, maximum, years     4 years    
Product warranty accrual, current 301.8   $ 301.8   $ 308.6
Product warranty accrual, noncurrent $ 57.6   $ 57.6   $ 52.3