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Debt (Textual) (Details) - USD ($)
1 Months Ended 6 Months Ended
Jan. 31, 2019
Dec. 31, 2018
May 04, 2019
May 05, 2018
Debt Instrument [Line Items]        
Short-term debt borrowed     $ 75,000,000 $ 0
Repayments of debt     75,000,000 0
Repayments of debt     350,000,000 $ 1,620,000,000 [1]
Unsecured debt term | 3-Year term loan, due March 2020        
Debt Instrument [Line Items]        
Repayments of debt     $ 350,000,000.0  
Debt term     3 years  
Revolving Credit Facility        
Debt Instrument [Line Items]        
Amount available under credit facility     $ 1,000,000,000.0  
Short-term debt borrowed   $ 75,000,000.0    
Repayments of debt $ 75,000,000      
Interest expense, borrowings $ 200,000      
[1] Balances have been restated to reflect the full retrospective adoption of Accounting Standards Update (ASU) 2014-09, Revenue from Contracts with Customers (ASU 2014-09). See Note 1, Basis of Presentation, in the Notes to Condensed Consolidated Financial Statements.