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Acquisitions (Details) - USD ($)
3 Months Ended
Dec. 31, 2017
May 02, 2017
Mar. 27, 2017
E. I. du Pont de Nemours and Company | Scenario, Forecast      
Business Acquisition [Line Items]      
Amount to be paid for assets acquired $ 1,200,000,000    
Citigroup Global Markets Inc.      
Business Acquisition [Line Items]      
Fees incurred     $ 8,500,000
Citigroup Global Markets Inc. | Commitment Letter | Subsequent Event      
Business Acquisition [Line Items]      
Deferred fees   $ 3,800,000  
Citigroup Global Markets Inc. | Revolving Credit Facility      
Business Acquisition [Line Items]      
Line of credit, maximum borrowing capacity [1]     1,500,000,000.0
Citigroup Global Markets Inc. | Revolving Credit Facility | Subsequent Event      
Business Acquisition [Line Items]      
Line of credit, maximum borrowing capacity [1]   1,500,000,000.0  
Citigroup Global Markets Inc. | Term Loan Facility      
Business Acquisition [Line Items]      
Line of credit, maximum borrowing capacity [1]     750,000,000
Citigroup Global Markets Inc. | Term Loan Facility | Subsequent Event      
Business Acquisition [Line Items]      
Line of credit, maximum borrowing capacity [1]   $ 1,500,000,000.0  
Bridge Loan | Citigroup Global Markets Inc.      
Business Acquisition [Line Items]      
Line of credit, maximum borrowing capacity [1]     $ 1,500,000,000.0
[1] Letters of credit outstanding under our Credit Facility totaled $128.8 million and available funds under this facility were $1,247.3 million at March 31, 2017.