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Product Warranty (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Warranty reserve activity:          
Balance at beginning of period $ 361.3 $ 325.8 $ 360.9 $ 316.0  
Accruals for warranties issued during the period 48.0 50.2 99.1 108.7  
Settlements made (in cash or in kind) during the period (40.2) (34.1) (87.6) (90.0)  
Foreign currency translation 2.8 (17.1) (0.5) (9.9)  
Balance at end of period 371.9 $ 324.8 $ 371.9 $ 324.8  
Product warranty period, minimum, years     1 year    
Product warranty period, maximum, years     4 years    
Product warranty accrual, current 315.2   $ 315.2   $ 308.6
Product warranty accrual, noncurrent $ 56.7   $ 56.7   $ 52.3