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Borrowings - Additional Information (Details) - USD ($)
3 Months Ended
Mar. 18, 2019
Feb. 06, 2017
Sep. 30, 2020
Sep. 30, 2019
Sep. 01, 2020
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2016
Aug. 31, 2013
Debt Instrument [Line Items]                  
Principal amount     $ 1,787,900,000            
Fair value, senior notes     1,912,200,000            
Outstanding amount of line of credit     0     $ 0      
Long-term debt, excluding current portion                  
Debt Instrument [Line Items]                  
Principal amount     1,787,900,000            
Fair value, senior notes     1,912,200,000            
Senior Notes                  
Debt Instrument [Line Items]                  
Principal amount     1,250,000,000.0            
Senior Notes | Long-term debt, excluding current portion                  
Debt Instrument [Line Items]                  
Fair value, senior notes     1,374,200,000            
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     537,900,000            
Fair value, senior notes     537,900,000            
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     380,000,000.0            
Fair value, senior notes     380,000,000.0            
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     157,900,000            
Fair value, senior notes     $ 157,900,000            
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     1.22% 3.12%          
Fiscal 2014 Senior Notes | Senior Notes                  
Debt Instrument [Line Items]                  
Principal amount     $ 0           $ 400,000,000.0
Repayment of debt         $ 400,000,000.0        
Fair value, senior notes     0            
Fiscal 2016 Senior Notes | Senior Notes                  
Debt Instrument [Line Items]                  
Principal amount     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           $ 554,300,000      
Fiscal 2016 Senior Notes | Senior Notes | Long-term debt, excluding current portion                  
Debt Instrument [Line Items]                  
Fair value, senior notes     558,500,000            
Fiscal 2020 Senior Notes | Senior Notes                  
Debt Instrument [Line Items]                  
Principal amount     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     $ 815,700,000            
London Interbank Offered Rate (LIBOR) | Fiscal 2019 Revolving Credit Facility: | Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Variable interest rate 1.015%