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Debt - Senior Unsecured Notes (Details) - USD ($)
$ in Millions
1 Months Ended
May 04, 2021
Apr. 12, 2021
Apr. 30, 2021
Oct. 29, 2022
Jan. 29, 2022
Jun. 22, 2018
Debt Instrument [Line Items]            
Debt outstanding       $ 4,511.6 $ 4,548.0  
Senior Notes            
Debt Instrument [Line Items]            
Debt outstanding       $ 2,000.0    
Redemption price percentage   101.00% 101.00%      
Senior Notes | 1.650% 2026 Senior Notes            
Debt Instrument [Line Items]            
Aggregate principal amount   $ 500.0        
Stated interest rate   1.65%   1.65%    
Effective interest rate   1.839%        
Senior Notes | 2.450% 2028 Senior Notes            
Debt Instrument [Line Items]            
Aggregate principal amount   $ 750.0        
Stated interest rate   2.45%   2.45%    
Effective interest rate   2.554%        
Senior Notes | 2.950% 2031 Senior Notes            
Debt Instrument [Line Items]            
Aggregate principal amount   $ 750.0        
Stated interest rate   2.95%   2.95%    
Effective interest rate   3.043%        
Senior Notes | MTG/MTI Senior Notes            
Debt Instrument [Line Items]            
Debt outstanding       $ 1,000.0    
Senior Notes | MTG Senior Notes            
Debt Instrument [Line Items]            
Debt outstanding     $ 1,000.0      
Senior Notes | MTG Senior Notes Due 2023            
Debt Instrument [Line Items]            
Aggregate principal amount     $ 500.0     $ 500.0
Stated interest rate     4.20%     4.20%
Principal amount exchanged $ 433.9          
Effective interest rate     4.36%      
Senior Notes | MTG Senior Notes Due 2028            
Debt Instrument [Line Items]            
Aggregate principal amount     $ 500.0     $ 500.0
Stated interest rate     4.875%     4.875%
Principal amount exchanged $ 479.5          
Effective interest rate     4.94%      
Senior Notes | MTI Senior Notes Due 2023            
Debt Instrument [Line Items]            
Stated interest rate     4.20%      
Effective interest rate     4.502%      
Senior Notes | MTI Senior Notes Due 2028            
Debt Instrument [Line Items]            
Stated interest rate     4.875%      
Effective interest rate     4.988%