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Basis of Presentation Basis of Presentation (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Increase in costs of sales $ 544.8 $ 441.5 $ 1,611.6 $ 1,315.3    
Decrease in inventories 412.0   412.0     $ 349.3
Increase in other current assets 77.6   77.6     $ 19.6
ASC 606            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Contract with Customer, Asset, Gross         $ 28.1  
Contract with customer asset, net 54.6   54.6   22.1  
ASC 606 Deferred Tax Liability         2.3  
Contract with customer, asset, reduced inventories         19.1  
ASC 606 | Difference between Revenue Guidance in Effect before and after Topic 606            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Increase in revenues from contracts with customers (1.4)   17.2      
Increase in costs of sales (0.1)   12.0      
Decrease in inventories 40.0   40.0      
Increase in other current assets 54.6   54.6      
ASC 606 | Retained Earnings            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cumulative effect of new accounting principle in period of adoption         $ 6.7  
Change resulting from ASU No. 2017-07 [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results $ 5.3 $ 3.3 $ 15.7 $ 10.0