v3.26.1
Borrowings - Schedule of Senior Notes (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Sep. 30, 2025
Sep. 30, 2019
Sep. 30, 2018
Mar. 31, 2014
Mar. 31, 2013
Debt Instrument [Line Items]                
Aggregate Principal Amount $ 3,033.7   $ 3,025.1          
Interest Expense $ 27.5 $ 17.2            
3.500% Senior Notes Due 9/19/2029                
Debt Instrument [Line Items]                
Interest rate (percent) 3.50%              
Aggregate Principal Amount $ 425.0   425.0          
5.050% Senior Notes Due 9/19/2035                
Debt Instrument [Line Items]                
Interest rate (percent) 5.05%              
Aggregate Principal Amount $ 800.0   800.0          
5.625% Senior Notes Due 3/30/2043                
Debt Instrument [Line Items]                
Interest rate (percent) 5.625%              
Aggregate Principal Amount $ 600.0   600.0          
5.650% Senior Notes Due 9/15/2048                
Debt Instrument [Line Items]                
Interest rate (percent) 5.65%              
Aggregate Principal Amount $ 350.0   350.0          
Senior Notes | 3.500% Senior Notes Due 9/19/2029                
Debt Instrument [Line Items]                
Interest rate (percent) 3.50%              
Aggregate Principal Amount $ 425.0              
Fair Value 410.3   417.8          
Interest Expense $ 3.8 3.8            
Senior notes percentage of par value (percent)         99.841%      
Senior Notes | 5.050% Senior Notes Due 9/19/2035                
Debt Instrument [Line Items]                
Interest rate (percent) 5.05%              
Aggregate Principal Amount $ 800.0              
Fair Value 774.2   800.9          
Interest Expense 10.3 0.0            
Senior notes percentage of par value (percent)       99.767%        
Senior Notes | 5.625% Senior Notes Due 3/30/2043                
Debt Instrument [Line Items]                
Aggregate Principal Amount 600.0           $ 200.0 $ 400.0
Fair Value 574.1   600.7          
Interest Expense 8.4 8.4            
Senior notes percentage of par value (percent)             104.315% 99.583%
Senior Notes | 5.650% Senior Notes Due 9/15/2048                
Debt Instrument [Line Items]                
Aggregate Principal Amount 350.0              
Fair Value 330.4   $ 347.5          
Interest Expense $ 5.0 $ 5.0            
Senior notes percentage of par value (percent)           99.914%