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Debt - Long-term Debt Footnote (Detail)
€ in Millions
Jun. 30, 2021
EUR (€)
Jun. 30, 2021
USD ($)
Apr. 15, 2021
Mar. 08, 2021
Jan. 20, 2021
Nov. 02, 2020
USD ($)
Sep. 30, 2020
EUR (€)
Sep. 30, 2020
USD ($)
Aug. 12, 2020
Jun. 30, 2020
3.000% Senior Secured Notes due 2031                    
Debt Instrument [Line Items]                    
Interest rate 3.00% 3.00%               3.00%
5.500% Senior Notes due 2026                    
Debt Instrument [Line Items]                    
Interest rate 5.50% 5.50%               5.50%
Acquisition Corp. | 3.625% Senior Secured Notes due 2026                    
Debt Instrument [Line Items]                    
Interest rate 3.625% 3.625%                
Face or principal amount of debt instrument | € € 445           € 445      
Acquisition Corp. | 2.750% Senior Secured Notes due 2028                    
Debt Instrument [Line Items]                    
Interest rate 2.75% 2.75%                
Face or principal amount of debt instrument | € € 325           € 325      
Acquisition Corp. | 3.875% Senior Secured Notes due 2030                    
Debt Instrument [Line Items]                    
Interest rate 3.875% 3.875%     3.875%          
Acquisition Corp. | 3.000% Senior Secured Notes due 2031                    
Debt Instrument [Line Items]                    
Interest rate 3.00% 3.00%     3.00% 3.00%     3.00%  
Face or principal amount of debt instrument           $ 250,000,000        
Acquisition Corp. | 5.500% Senior Notes due 2026                    
Debt Instrument [Line Items]                    
Interest rate 5.50% 5.50% 5.50% 5.50%            
Acquisition Corp. | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Commitments under revolving credit facility   $ 300,000,000           $ 300,000,000    
Letters of credit outstanding   10,000,000           10,000,000    
Revolving credit facility outstanding   $ 0           $ 0