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Operations and Summary of Significant Accounting Policies - Accrued Expense and Reserves (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounting Policies [Abstract]      
Reserve for volume discounts and sales incentives $ 489.1 $ 407.3  
Warranty reserves 273.6 223.1  
Accrued employee compensation and benefits 283.3 234.0  
Accrued taxes 135.4 113.5  
Other 226.5 182.9  
Accrued expenses 1,407.9 1,160.8  
Movement in Standard Product Warranty Accrual [Roll Forward]      
Warranty reserves, beginning of period 255.6 230.3 $ 284.6
Acquisitions 5.1 3.7 0.2
Accruals for warranties issued during the year 215.9 214.6 152.6
Settlements made (in cash or in kind) during the year (183.1) (188.7) (186.2)
Foreign currency translation 22.5 (4.3) (20.9)
Warranty reserves, end of period $ 316.0 255.6 $ 230.3
Minimum product warranty period 1 year    
Maximum product warranty period 4 years    
Warranty reserves included in other noncurrent liabilities $ 42.4 $ 32.5