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Borrowing Arrangements (Additional Information) (Details)
1 Months Ended 3 Months Ended
Apr. 30, 2019
USD ($)
Dec. 17, 2018
USD ($)
Jul. 27, 2017
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2012
USD ($)
Apr. 30, 2019
USD ($)
Dec. 16, 2018
USD ($)
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity   $ 650,000,000.0            
Term Loan                
Debt Instrument [Line Items]                
Debt instrument, face amount $ 375,000,000.0 500,000,000.0         $ 375,000,000.0  
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 488,200,000           $ 488,200,000  
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%      
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 fair value 763,500,000           763,500,000  
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 357,200,000           357,200,000  
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           $ 0  
Revolving Credit Facility | Term Loan                
Debt Instrument [Line Items]                
Interest rate 3.539%              
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