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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Related Party Transaction [Line Items]        
Ownership interest of controlling interest 50.00%      
Dividends from related parties   $ 40.5 $ 29.4  
Investments in retail finance joint ventures   $ 3.1 5.8 $ 0.8
Rabobank        
Related Party Transaction [Line Items]        
Ownership interest of controlling interest   51.00%    
TAFE        
Related Party Transaction [Line Items]        
Dividends from related parties   $ 2.0 1.8 1.8
Cost method investment, ownership percentage   23.75%    
Beneficial ownership of related parties (in shares)   12,150,152    
Beneficial ownership of related parties, maximum shares allowed per letter agreement (in shares)   12,150,152    
Purchases from related party   $ 92.7 109.6 102.0
Revenue from related parties   1.5 1.8 1.2
PPG Industries, Inc.        
Related Party Transaction [Line Items]        
Purchases from related party   4.4 3.5 7.2
Praxair Inc        
Related Party Transaction [Line Items]        
Purchases from related party   $ 6.2 $ 1.6 $ 1.5