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Borrowing Arrangements (Details)
1 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2012
USD ($)
Jan. 31, 2020
USD ($)
Jan. 31, 2021
USD ($)
Debt Instrument [Line Items]            
Maximum borrowing capacity $ 650,000,000.0          
Senior Notes due 2020            
Debt Instrument [Line Items]            
Debt issuance costs     $ 3,800,000      
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
Revolving credit facility | December 17, 2018 credit agreement | Minimum | Base rate            
Debt Instrument [Line Items]            
Basis spread on variable rate 0.00%          
Revolving credit facility | December 17, 2018 credit agreement | Minimum | London interbank offered rate (LIBOR)            
Debt Instrument [Line Items]            
Basis spread on variable rate 0.90%          
Revolving credit facility | December 17, 2018 credit agreement | Maximum | Base rate            
Debt Instrument [Line Items]            
Basis spread on variable rate 0.50%          
Revolving credit facility | December 17, 2018 credit agreement | Maximum | London interbank offered rate (LIBOR)            
Debt Instrument [Line Items]            
Basis spread on variable rate 1.50%          
Senior notes            
Debt Instrument [Line Items]            
Proceeds from debt, net of issuance costs     296,400,000      
Repayments of debt     452,100,000      
Senior notes | 2.85 Notes due January 15 2030            
Debt Instrument [Line Items]            
Face amount         $ 500,000,000.0 500,000,000.0
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  
Senior notes | Senior Notes due 2020            
Debt Instrument [Line Items]            
Face amount     $ 450,000,000.0      
Stated interest rate     3.125%      
Unamortized discount     $ 600,000      
Proceeds from debt, net of issuance costs     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        
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        
Senior notes | $300 2015 Notes            
Debt Instrument [Line Items]            
Face amount     $ 300,000,000     300,000,000.0
Stated interest rate     4.375%      
Unamortized discount     $ 1,100,000      
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
Stated interest rate       3.60%    
Unamortized discount       $ 500,000    
Debt issuance costs       2,800,000    
Proceeds from debt, net of issuance costs       $ 346,700,000    
Senior notes | 2015 Notes            
Debt Instrument [Line Items]            
Debt redemption percentage of principle amount     101.00%      
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 January 31, 2020 | Revolving credit facility | December 17, 2018 credit agreement            
Debt Instrument [Line Items]            
Debt covenant, leverage ratio, maximum 3.00