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Debt - Maximum Commitments and Net Amounts Available under Credit Facilities (Details) - USD ($)
Oct. 31, 2020
Oct. 16, 2020
Apr. 01, 2020
Oct. 31, 2019
Line of Credit Facility [Line Items]        
Total debt $ 1,793,200,000     $ 1,826,300,000
Outstanding Letters of Credit 4,500,000     4,800,000
Credit Agreement 2020 And Term Loan Agreement 2020        
Line of Credit Facility [Line Items]        
Total 2,490,000,000.0      
Total debt 1,734,000,000.0      
Line of Credit | Credit Agreement 2020 | Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Facility Limit 1,290,000,000.0   $ 1,290,000,000  
Outstanding Borrowings 534,000,000.0      
Outstanding Letters of Credit 1,400,000      
Total Amount Available 754,600,000      
Line of Credit | Credit Agreement 2020 | Term Loan Facility 2020        
Line of Credit Facility [Line Items]        
Facility Limit 850,000,000.0   $ 850,000,000.0  
Outstanding Borrowings 850,000,000.0      
Term loan        
Line of Credit Facility [Line Items]        
Outstanding Borrowings 350,000,000.0     $ 500,000,000.0
Term loan | Term Loan Agreement 2020        
Line of Credit Facility [Line Items]        
Facility Limit 350,000,000.0 $ 350,000,000.0    
Outstanding Borrowings $ 350,000,000.0