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Debt - Long-term Debt Footnote (Detail)
€ in Millions
Apr. 15, 2021
Mar. 31, 2021
EUR (€)
Mar. 31, 2021
USD ($)
Mar. 08, 2021
Jan. 20, 2021
Nov. 02, 2020
USD ($)
Sep. 30, 2020
EUR (€)
Sep. 30, 2020
USD ($)
Aug. 12, 2020
Mar. 31, 2020
3.000% Senior Secured Notes due 2031                    
Debt Instrument [Line Items]                    
Interest rate   3.00% 3.00%             3.00%
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%            
Acquisition Corp. | 5.500% Senior Notes due 2026 | Subsequent Event                    
Debt Instrument [Line Items]                    
Interest rate 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