v3.25.4
Debt - Schedule of Outstanding Debt (Details) - USD ($)
$ in Millions
Jan. 31, 2026
Aug. 02, 2025
Jun. 30, 2025
Feb. 01, 2025
Sep. 18, 2023
Apr. 12, 2021
Debt Instrument [Line Items]            
Total borrowings $ 4,499.9     $ 4,090.5    
Less: Unamortized debt discount and issuance cost (29.3)     (26.7)    
Net carrying amount of debt 4,470.6     4,063.8    
Non-current portion $ 3,970.8     $ 3,934.3    
Short-term debt, weighted average interest rate 1.65%     5.785%    
Term Loan            
Debt Instrument [Line Items]            
Total borrowings $ 0.0     $ 590.6    
Less: Current portion 499.8     129.5    
Term Loan | 2026 Term Loan - 5-Year Tranche            
Debt Instrument [Line Items]            
Total borrowings 0.0 $ 557.8   590.6    
Senior Notes            
Debt Instrument [Line Items]            
Total borrowings $ 4,499.9     3,499.9    
Senior Notes | 4.875% MTG/MTI 2028 Senior Notes            
Debt Instrument [Line Items]            
Stated interest rate (as a percent) 4.875%          
Total borrowings $ 499.9     499.9    
Senior Notes | MTG 2028 Senior Notes            
Debt Instrument [Line Items]            
Effective interest rate (as a percent) 4.94%          
Senior Notes | MTI 2028 Senior Notes            
Debt Instrument [Line Items]            
Effective interest rate (as a percent) 4.988%          
Senior Notes | 1.650% 2026 Senior Notes            
Debt Instrument [Line Items]            
Stated interest rate (as a percent) 1.65%         1.65%
Effective interest rate (as a percent) 1.839%          
Total borrowings $ 500.0     500.0    
Senior Notes | 2.450% 2028 Senior Notes            
Debt Instrument [Line Items]            
Stated interest rate (as a percent) 2.45%         2.45%
Effective interest rate (as a percent) 2.554%          
Total borrowings $ 750.0     750.0    
Senior Notes | 5.750% 2029 Senior Notes            
Debt Instrument [Line Items]            
Stated interest rate (as a percent) 5.75%       5.75%  
Effective interest rate (as a percent) 5.891%          
Total borrowings $ 500.0     500.0    
Senior Notes | 4.750% 2030 Senior Notes            
Debt Instrument [Line Items]            
Stated interest rate (as a percent) 4.75%   4.75%      
Effective interest rate (as a percent) 4.88%          
Total borrowings $ 500.0     0.0    
Senior Notes | 2.950% 2031 Senior Notes            
Debt Instrument [Line Items]            
Stated interest rate (as a percent) 2.95%         2.95%
Effective interest rate (as a percent) 3.043%          
Total borrowings $ 750.0     750.0    
Senior Notes | 5.950% 2033 Senior Notes            
Debt Instrument [Line Items]            
Stated interest rate (as a percent) 5.95%       5.95%  
Effective interest rate (as a percent) 6.082%          
Total borrowings $ 500.0     500.0    
Senior Notes | 5.450% 2035 Senior Notes            
Debt Instrument [Line Items]            
Stated interest rate (as a percent) 5.45%   5.45%      
Effective interest rate (as a percent) 5.531%          
Total borrowings $ 500.0     $ 0.0