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Product Warranty (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Warranty reserve activity:          
Balance at beginning of period $ 296.9 $ 240.6 $ 255.6 $ 230.3  
Acquisitions 2.1 3.1 2.1 3.7  
Accruals for warranties issued during the period 47.7 43.3 152.6 138.7  
Settlements made (in cash or in kind) during the period (49.3) (40.1) (127.4) (128.3)  
Foreign currency translation 6.2 2.0 20.7 4.5  
Balance at end of period 303.6 $ 248.9 $ 303.6 $ 248.9  
Product warranty period, minimum, years     1 year    
Product warranty period, maximum, years     4 years    
Product warranty accrual, current 267.4   $ 267.4   $ 223.1
Product warranty accrual, noncurrent $ 36.2   $ 36.2   $ 32.5