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Borrowing Arrangements (Additional Information) (Details)
1 Months Ended
Jul. 31, 2019
USD ($)
Jul. 27, 2017
USD ($)
Dec. 31, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2012
USD ($)
Jan. 31, 2019
USD ($)
Nov. 30, 2018
USD ($)
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity     $ 650,000,000.0          
Current portion of long-term notes payable, net $ 449,200,000           $ 0  
Term Loan                
Debt Instrument [Line Items]                
Debt instrument, face amount 250,000,000.0   500,000,000.0          
Senior Notes | 3.5% Notes due June 15, 2027                
Debt Instrument [Line Items]                
Debt instrument, face amount       $ 500,000,000.0        
Debt instrument, stated interest rate       3.50%        
Debt instrument, unamortized discount       $ 3,100,000        
Debt issuance costs, gross       4,900,000        
Proceeds from debt, net of issuance costs       $ 492,000,000.0        
Debt issuance redemption discount premium, percentage of principle amount       101.00%        
Debt fair value $ 508,900,000              
Senior Notes | Senior Notes 2017                
Debt Instrument [Line Items]                
Debt instrument, face amount           $ 400,000,000.0    
Debt instrument, stated interest rate           1.95%    
Redemption price   $ 400,900,000            
Repayments of debt   $ 401,800,000            
Senior Notes | Senior Notes due 2020                
Debt Instrument [Line Items]                
Debt instrument, face amount         $ 450,000,000.0      
Debt instrument, stated interest rate 3.125%       3.125%      
Current portion of long-term notes payable, net $ 450,000,000.0              
Senior Notes | Senior Notes due 2025                
Debt Instrument [Line Items]                
Debt instrument, face amount         $ 300,000,000.0      
Debt instrument, stated interest rate         4.375%      
Senior Notes | 2015 Senior Notes                
Debt Instrument [Line Items]                
Debt instrument, unamortized discount         $ 1,700,000      
Debt issuance costs, gross         6,300,000      
Proceeds from debt, net of issuance costs         $ 742,000,000.0      
Debt issuance redemption discount premium, percentage of principle amount         101.00%      
Debt fair value $ 772,500,000              
Weighted average interest rate 4.375%              
Senior Notes | Senior Notes 2022                
Debt Instrument [Line Items]                
Debt instrument, face amount           $ 350,000,000.0    
Debt instrument, stated interest rate           3.60%    
Senior Notes | 2012 Senior Notes                
Debt Instrument [Line Items]                
Debt instrument, unamortized discount           $ 4,500,000    
Debt issuance costs, gross           6,100,000    
Proceeds from debt, net of issuance costs           $ 739,300,000    
Debt fair value $ 358,100,000              
Revolving Credit Facility                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity               $ 400,000,000.0
Revolving Credit Facility | December 17, 2018 Credit Agreement                
Debt Instrument [Line Items]                
Line of credit facility, additional borrowings available     $ 350,000,000.0          
Line of credit facility, outstanding borrowings $ 0              
Revolving Credit Facility | Term Loan                
Debt Instrument [Line Items]                
Interest rate 3.398%              
London Interbank Offered Rate (LIBOR) | Term Loan                
Debt Instrument [Line Items]                
Basis spread on variable interest rate     1.125%          
Minimum | Base Rate | Revolving Credit Facility | December 17, 2018 Credit Agreement                
Debt Instrument [Line Items]                
Basis spread on variable interest rate     0.00%          
Minimum | Base Rate | Revolving Credit Facility | Term Loan                
Debt Instrument [Line Items]                
Basis spread on variable interest 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 interest rate     0.90%          
Minimum | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Term Loan                
Debt Instrument [Line Items]                
Basis spread on variable interest rate     0.875%          
Maximum | Base Rate | Revolving Credit Facility | December 17, 2018 Credit Agreement                
Debt Instrument [Line Items]                
Basis spread on variable interest rate     0.50%          
Maximum | Base Rate | Revolving Credit Facility | Term Loan                
Debt Instrument [Line Items]                
Basis spread on variable interest 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 interest rate     1.50%          
Maximum | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Term Loan                
Debt Instrument [Line Items]                
Basis spread on variable interest rate     1.625%          
Debt Instrument, Covenant Period, Fiscal Quarter Ending January 31, 2019 | Revolving Credit Facility | December 17, 2018 Credit Agreement                
Debt Instrument [Line Items]                
Debt covenant, minimum interest coverage     2.50          
Debt Instrument, Covenant Period, Fiscal Quarter Ending April 30, 2019 | Revolving Credit Facility | December 17, 2018 Credit Agreement                
Debt Instrument [Line Items]                
Debt covenant, minimum interest coverage     3.00          
Debt Instrument, Covenant Period, Fiscal Quarter Ending July 31, 2019 | Revolving Credit Facility | December 17, 2018 Credit Agreement                
Debt Instrument [Line Items]                
Debt covenant, maximum leverage ratio     3.50          
Debt Instrument, Covenant Period, Fiscal Quarter Ending January 31, 2020 | Revolving Credit Facility | December 17, 2018 Credit Agreement                
Debt Instrument [Line Items]                
Debt covenant, maximum leverage ratio     3.00