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Borrowings - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Mar. 18, 2019
Feb. 06, 2017
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Jun. 30, 2019
Jun. 30, 2016
Aug. 31, 2013
Debt Instrument [Line Items]                    
Principal amount     $ 2,092,500,000   $ 2,092,500,000          
Fair value, senior notes     2,021,000,000.0   2,021,000,000.0          
Outstanding amount of line of credit     0   0     $ 0    
Long-term debt, excluding current portion                    
Debt Instrument [Line Items]                    
Principal amount     1,692,500,000   1,692,500,000          
Fair value, senior notes     1,622,100,000   1,622,100,000          
Senior Notes                    
Debt Instrument [Line Items]                    
Principal amount     1,250,000,000.0   1,250,000,000.0          
Senior Notes | Long-term debt, excluding current portion                    
Debt Instrument [Line Items]                    
Fair value, senior notes     1,179,600,000   1,179,600,000          
Fiscal 2019 Revolving Credit Facility: | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Revolving credit facility maximum borrowing capacity $ 1,500,000,000                  
Term 5 years                  
Tranche borrowing period 360 days                  
Annual facility fee (as basis points) 0.11%                  
Principal amount     442,500,000   442,500,000          
Fair value, senior notes     442,500,000   442,500,000          
Fiscal 2019 Revolving Credit Facility, U.S. Dollar Tranche | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Revolving credit facility maximum borrowing capacity $ 1,100,000,000                  
Principal amount     250,000,000.0   250,000,000.0          
Fair value, senior notes     250,000,000.0   250,000,000.0          
Fiscal 2019 Revolving Credit Facility, Multicurrency Tranche | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Revolving credit facility maximum borrowing capacity $ 400,000,000.0                  
Principal amount     192,500,000   192,500,000          
Fair value, senior notes     $ 192,500,000   $ 192,500,000          
Fiscal 2017 Revolving Credit Facility | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Revolving credit facility maximum borrowing capacity   $ 1,000,000,000.0                
Term   5 years                
Revolving Credit Facilities | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Weighted-average interest rate of revolving credit facilities     2.69% 3.41% 2.90% 3.24%        
Fiscal 2014 Senior Notes | Senior Notes                    
Debt Instrument [Line Items]                    
Principal amount     $ 400,000,000.0   $ 400,000,000.0         $ 400,000,000.0
Interest rate, senior notes                   3.95%
Percentage of principal amount                   99.871%
Effective interest rate, senior notes                   3.971%
Fair value, senior notes     398,900,000   398,900,000          
Fiscal 2014 Senior Notes | Senior Notes | Level 1                    
Debt Instrument [Line Items]                    
Fair value, senior notes     398,900,000   398,900,000     405,400,000    
Fiscal 2016 Senior Notes | Senior Notes                    
Debt Instrument [Line Items]                    
Principal amount     500,000,000.0   500,000,000.0       $ 500,000,000.0  
Interest rate, senior notes                 3.40%  
Percentage of principal amount                 99.589%  
Effective interest rate, senior notes                 3.449%  
Fiscal 2016 Senior Notes | Senior Notes | Level 1                    
Debt Instrument [Line Items]                    
Fair value, senior notes               $ 509,800,000    
Fiscal 2016 Senior Notes | Senior Notes | Long-term debt, excluding current portion                    
Debt Instrument [Line Items]                    
Fair value, senior notes     505,300,000   505,300,000          
Fiscal 2020 Senior Notes | Senior Notes                    
Debt Instrument [Line Items]                    
Principal amount     750,000,000.0   750,000,000.0   $ 750,000,000.0      
Interest rate, senior notes             2.90%      
Percentage of principal amount             99.717%      
Effective interest rate, senior notes             2.933%      
Fiscal 2020 Senior Notes | Senior Notes | Long-term debt, excluding current portion                    
Debt Instrument [Line Items]                    
Fair value, senior notes     $ 674,300,000   $ 674,300,000          
London Interbank Offered Rate (LIBOR) | Fiscal 2019 Revolving Credit Facility: | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Variable interest rate 1.015%