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Borrowings - Additional Information (Details) - USD ($)
1 Months Ended 12 Months Ended
Mar. 18, 2019
Feb. 06, 2017
Dec. 31, 2019
Jun. 30, 2016
Aug. 31, 2013
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Debt Instrument [Line Items]                
Principal amount outstanding at June 30, 2020           $ 1,799,800,000    
Outstanding borrowings           1,387,600,000 $ 1,470,400,000  
Unused available capacity           1,350,200,000    
Fair value of fixed-rate notes           1,909,700,000    
Outstanding borrowings under lines of credit           0 0  
Long-term debt, excluding current portion                
Debt Instrument [Line Items]                
Principal amount outstanding at June 30, 2020           1,399,800,000    
Outstanding borrowings             1,470,400,000  
Unused available capacity           1,350,200,000    
Fair value of fixed-rate notes           1,507,700,000    
Senior Notes                
Debt Instrument [Line Items]                
Principal amount outstanding at June 30, 2020           1,250,000,000.0    
Outstanding borrowings           1,237,800,000 $ 894,700,000  
Fair value of fixed-rate notes           $ 1,357,800,000    
Revolving Credit Facilities | Revolving Credit Facility                
Debt Instrument [Line Items]                
Weighted-average interest rate           2.59% 3.26% 2.44%
Fiscal 2017 Revolving Credit Facility | Revolving Credit Facility                
Debt Instrument [Line Items]                
Maximum borrowing capacity   $ 1,000,000,000.0            
Debt instrument, term   5 years            
Fiscal 2019 Revolving Credit Facility | London Interbank Offered Rate (LIBOR)                
Debt Instrument [Line Items]                
Basis spread on variable rate 1.015%              
Fiscal 2019 Revolving Credit Facility | Revolving Credit Facility                
Debt Instrument [Line Items]                
Maximum borrowing capacity $ 1,500,000,000              
Principal amount outstanding at June 30, 2020           $ 149,800,000    
Debt instrument, term 5 years              
Outstanding borrowings           149,800,000 $ 575,700,000  
Unused available capacity           1,350,200,000    
Borrowing tranche period 360 days              
Commitment fee percentage 0.11%              
Fair value of fixed-rate notes           149,800,000    
Fiscal 2019 Revolving Credit Facility, U.S. Dollar Tranche | Revolving Credit Facility                
Debt Instrument [Line Items]                
Maximum borrowing capacity $ 1,100,000,000              
Outstanding borrowings             360,000,000.0  
Unused available capacity           1,100,000,000.0    
Fiscal 2019 Revolving Credit Facility Multicurrency Tranche | Revolving Credit Facility                
Debt Instrument [Line Items]                
Maximum borrowing capacity $ 400,000,000.0              
Principal amount outstanding at June 30, 2020           149,800,000    
Outstanding borrowings           149,800,000 215,700,000  
Unused available capacity           250,200,000    
Fair value of fixed-rate notes           149,800,000    
Fiscal 2014 Senior Notes (a) | Senior Notes                
Debt Instrument [Line Items]                
Principal amount outstanding at June 30, 2020         $ 400,000,000.0      
Stated interest rate         3.95%      
Percentage of principal amount at issuance         99.871%      
Effective interest rate         3.971%      
Fiscal 2014 Senior Notes (a) | Senior Notes | Long-term debt, excluding current portion                
Debt Instrument [Line Items]                
Outstanding borrowings             399,200,000  
Fair value of fixed-rate notes           402,100,000 405,400,000  
Fiscal 2016 Senior Notes | Senior Notes                
Debt Instrument [Line Items]                
Principal amount outstanding at June 30, 2020       $ 500,000,000.0        
Outstanding borrowings           496,100,000 495,500,000  
Stated interest rate       3.40%        
Percentage of principal amount at issuance       99.589%        
Effective interest rate       3.449%        
Fiscal 2016 Senior Notes | Senior Notes | Long-term debt, excluding current portion                
Debt Instrument [Line Items]                
Fair value of fixed-rate notes           554,300,000 509,800,000  
Fiscal 2020 Senior Notes | Senior Notes                
Debt Instrument [Line Items]                
Principal amount outstanding at June 30, 2020     $ 750,000,000.0     750,000,000.0    
Outstanding borrowings           741,700,000 $ 0  
Fair value of fixed-rate notes           $ 803,600,000    
Stated interest rate     2.90%          
Percentage of principal amount at issuance     99.717%          
Effective interest rate     2.933%