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Borrowing Arrangements (Details)
1 Months Ended
Jan. 31, 2019
USD ($)
Dec. 17, 2018
USD ($)
Jul. 27, 2017
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2012
USD ($)
Dec. 16, 2018
USD ($)
Jan. 31, 2018
USD ($)
Term Loan                
Debt Disclosure [Line Items]                
Face amount   $ 500,000,000.0            
Senior Notes | 2017 Notes                
Debt Disclosure [Line Items]                
Face amount       $ 500,000,000.0        
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        
Debt redemption percentage of principle amount (as a percent)       101.00%        
Fair value disclosure $ 474,300,000              
Senior Notes | Senior Notes due 2017                
Debt Disclosure [Line Items]                
Face amount           $ 400,000,000.0    
Stated interest rate           1.95%    
Repayments of debt     $ 401,800,000 $ 400,000,000.0        
Debt redemption price     $ 400,900,000          
Senior Notes | Senior Notes due 2020                
Debt Disclosure [Line Items]                
Face amount         $ 450,000,000.0      
Stated interest rate         3.125%      
Senior Notes | Senior Notes due 2025                
Debt Disclosure [Line Items]                
Face amount         $ 300,000,000.0      
Stated interest rate         4.375%      
Senior Notes | 2015 Notes                
Debt Disclosure [Line Items]                
Unamortized discount         $ 1,700,000      
Debt issuance costs         6,300,000      
Proceeds from debt, net of issuance costs         $ 742,000,000.0      
Debt redemption percentage of principle amount (as a percent)         101.00%      
Fair value disclosure 754,200,000              
Senior Notes | Senior Notes due 2022                
Debt Disclosure [Line Items]                
Face amount           $ 350,000,000.0    
Stated interest rate           3.60%    
Senior Notes | 2012 Senior Notes                
Debt Disclosure [Line Items]                
Unamortized discount           $ 4,500,000    
Debt issuance costs           6,100,000    
Proceeds from debt, net of issuance costs           $ 739,300,000    
Fair value disclosure 349,600,000              
Revolving Credit Facility                
Debt Disclosure [Line Items]                
Maximum borrowing capacity             $ 400,000,000.0  
Revolving Credit Facility | December 17, 2018 Credit Agreement                
Debt Disclosure [Line Items]                
Maximum borrowing capacity   650,000,000.0            
Line of credit facility, increase limit   $ 350,000,000.0            
Line of credit facility, outstanding borrowings $ 0             $ 0
Revolving Credit Facility | Term Loan                
Debt Disclosure [Line Items]                
Interest rate (as a percentage) 3.628%              
Fiscal quarter ending January 31, 2019 | Revolving Credit Facility | December 17, 2018 Credit Agreement                
Debt Disclosure [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 Disclosure [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 Disclosure [Line Items]                
Debt covenant, leverage ratio, maximum   3.50            
Fiscal quarter ending January 31, 2020 | Revolving Credit Facility | December 17, 2018 Credit Agreement                
Debt Disclosure [Line Items]                
Debt covenant, leverage ratio, maximum   3.00            
London Interbank Offered Rate (LIBOR) | Term Loan                
Debt Disclosure [Line Items]                
Basis spread on variable rate   1.125%            
Minimum | Base Rate | Revolving Credit Facility | December 17, 2018 Credit Agreement                
Debt Disclosure [Line Items]                
Basis spread on variable rate   0.00%            
Minimum | Base Rate | Revolving Credit Facility | Term Loan                
Debt Disclosure [Line Items]                
Basis spread on variable rate   0.00%            
Minimum | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | December 17, 2018 Credit Agreement                
Debt Disclosure [Line Items]                
Basis spread on variable rate   0.90%            
Minimum | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Term Loan                
Debt Disclosure [Line Items]                
Basis spread on variable rate   0.875%            
Maximum | Base Rate | Revolving Credit Facility | December 17, 2018 Credit Agreement                
Debt Disclosure [Line Items]                
Basis spread on variable rate   0.50%            
Maximum | Base Rate | Revolving Credit Facility | Term Loan                
Debt Disclosure [Line Items]                
Basis spread on variable rate   0.625%            
Maximum | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | December 17, 2018 Credit Agreement                
Debt Disclosure [Line Items]                
Basis spread on variable rate   1.50%            
Maximum | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Term Loan                
Debt Disclosure [Line Items]                
Basis spread on variable rate   1.625%