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Borrowing Arrangements (Details)
1 Months Ended 12 Months Ended
Jan. 31, 2019
USD ($)
Dec. 17, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2012
USD ($)
Jan. 31, 2020
USD ($)
Dec. 31, 2018
USD ($)
Dec. 16, 2018
USD ($)
Debt Instrument [Line Items]                
Maximum borrowing capacity   $ 650,000,000.0            
Short-term debt, weighted average interest rate over time           4.375%    
Senior Notes due 2022                
Debt Instrument [Line Items]                
Debt issuance costs       $ 3,800,000        
Term Loan                
Debt Instrument [Line Items]                
Face amount           $ 450,000,000.0 $ 500,000,000.0  
Senior Notes                
Debt Instrument [Line Items]                
Proceeds from debt, net of issuance costs       296,400,000        
Senior Notes | 2.85 Notes due January 15 2030                
Debt Instrument [Line Items]                
Face amount           $ 500,000,000.0    
Stated interest rate           2.85%    
Unamortized discount           $ 1,100,000    
Debt issuance costs           4,800,000    
Proceeds from debt, net of issuance costs           494,100,000    
Fair value disclosure           513,300,000    
Senior Notes | 2017 Notes                
Debt Instrument [Line Items]                
Stated interest rate     3.50%          
Unamortized discount     $ 3,100,000          
Debt issuance costs     4,900,000          
Proceeds from debt, net of issuance costs     492,000,000.0 445,600,000        
Senior Notes | Senior Notes due 2017                
Debt Instrument [Line Items]                
Face amount     500,000,000.0     500,000,000.0    
Repayments of debt     $ 400,000,000.0          
Fair value disclosure           535,000,000.0    
Senior Notes | Senior Notes due 2020                
Debt Instrument [Line Items]                
Face amount       $ 450,000,000.0   450,000,000.0    
Stated interest rate       3.125%        
Unamortized discount       $ 600,000        
Fair value disclosure           451,500,000    
Senior Notes | Senior Notes due 2025                
Debt Instrument [Line Items]                
Face amount       $ 300,000,000.0   300,000,000.0    
Stated interest rate       4.375%        
Fair value disclosure           331,900,000    
Senior Notes | 2015 Notes                
Debt Instrument [Line Items]                
Unamortized discount       $ 1,100,000        
Debt redemption percentage of principle amount (as a percent)       101.00%        
Senior Notes | Senior Notes due 2022                
Debt Instrument [Line Items]                
Stated interest rate         3.60%      
Debt issuance costs       $ 2,500,000        
Senior Notes | 2012 Senior Notes                
Debt Instrument [Line Items]                
Face amount         $ 350,000,000.0 350,000,000.0    
Unamortized discount         500,000      
Debt issuance costs         2,800,000      
Proceeds from debt, net of issuance costs         $ 346,700,000      
Fair value disclosure           364,000,000.0    
Revolving Credit Facility                
Debt Instrument [Line Items]                
Maximum borrowing capacity               $ 400,000,000.0
Revolving Credit Facility | December 17, 2018 Credit Agreement                
Debt Instrument [Line Items]                
Line of credit facility, increase limit   $ 350,000,000.0            
Line of credit facility, outstanding borrowings $ 0         $ 0    
Revolving Credit Facility | Term Loan                
Debt Instrument [Line Items]                
Interest rate (as a percentage) 2.689%              
Fiscal quarter ending January 31, 2019 | Revolving Credit Facility | December 17, 2018 Credit Agreement                
Debt Instrument [Line Items]                
Debt covenant, interest coverage ratio, minimum   2.50            
Fiscal quarter ending April 30, 2019 | Revolving Credit Facility | December 17, 2018 Credit Agreement                
Debt Instrument [Line Items]                
Debt covenant, interest coverage ratio, minimum   3.00            
Fiscal quarter ending July 31, 2019 | Revolving Credit Facility | December 17, 2018 Credit Agreement                
Debt Instrument [Line Items]                
Debt covenant, leverage ratio, maximum   3.50            
Fiscal quarter ending January 31, 2020 | Revolving Credit Facility | December 17, 2018 Credit Agreement                
Debt Instrument [Line Items]                
Debt covenant, leverage ratio, maximum   3.00            
London Interbank Offered Rate (LIBOR) | Term Loan                
Debt Instrument [Line Items]                
Basis spread on variable rate   1.125%            
Minimum | Base Rate | Revolving Credit Facility | December 17, 2018 Credit Agreement                
Debt Instrument [Line Items]                
Basis spread on variable rate   0.00%            
Minimum | Base Rate | Revolving Credit Facility | Term Loan                
Debt Instrument [Line Items]                
Basis spread on variable rate   0.00%            
Minimum | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | December 17, 2018 Credit Agreement                
Debt Instrument [Line Items]                
Basis spread on variable rate   0.90%            
Minimum | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Term Loan                
Debt Instrument [Line Items]                
Basis spread on variable rate   0.875%            
Maximum | Base Rate | Revolving Credit Facility | December 17, 2018 Credit Agreement                
Debt Instrument [Line Items]                
Basis spread on variable rate   0.50%            
Maximum | Base Rate | Revolving Credit Facility | Term Loan                
Debt Instrument [Line Items]                
Basis spread on variable rate   0.625%            
Maximum | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | December 17, 2018 Credit Agreement                
Debt Instrument [Line Items]                
Basis spread on variable rate   1.50%            
Maximum | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Term Loan                
Debt Instrument [Line Items]                
Basis spread on variable rate   1.625%