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Borrowings - Schedule of Senior Notes (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Sep. 30, 2019
Sep. 30, 2018
Mar. 31, 2014
Mar. 31, 2013
Debt Instrument [Line Items]                  
Aggregate Principal Amount $ 3,014.3   $ 3,014.3   $ 2,164.4        
Interest Expense $ 18.4 $ 17.1 $ 53.0 $ 51.7          
3.500% Senior Notes Due 9/19/2029                  
Debt Instrument [Line Items]                  
Interest rate (percent) 3.50%   3.50%            
Aggregate Principal Amount $ 425.0   $ 425.0   425.0        
5.050% Senior Notes Due 9/19/2035                  
Debt Instrument [Line Items]                  
Interest rate (percent) 5.05%   5.05%            
Aggregate Principal Amount $ 800.0   $ 800.0   0.0        
5.625% Senior Notes Due 3/30/2043                  
Debt Instrument [Line Items]                  
Interest rate (percent) 5.625%   5.625%            
Aggregate Principal Amount $ 600.0   $ 600.0   600.0        
5.650% Senior Notes Due 9/15/2048                  
Debt Instrument [Line Items]                  
Interest rate (percent) 5.65%   5.65%            
Aggregate Principal Amount $ 350.0   $ 350.0   350.0        
Senior Notes | 3.500% Senior Notes Due 9/19/2029                  
Debt Instrument [Line Items]                  
Interest rate (percent) 3.50%   3.50%            
Aggregate Principal Amount $ 425.0   $ 425.0            
Fair Value 413.2   413.2   401.2        
Interest Expense $ 3.8 3.8 $ 11.5 11.5          
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%   5.05%            
Aggregate Principal Amount $ 800.0   $ 800.0            
Fair Value 797.7   797.7   0.0        
Interest Expense $ 1.3 0.0 $ 1.3 0.0          
Senior notes percentage of par value (percent) 99.767%   99.767%            
Senior Notes | 5.625% Senior Notes Due 3/30/2043                  
Debt Instrument [Line Items]                  
Aggregate Principal Amount $ 600.0   $ 600.0         $ 200.0 $ 400.0
Fair Value 603.1   603.1   589.5        
Interest Expense 8.4 8.4 25.3 25.3          
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   350.0            
Fair Value 348.5   348.5   $ 338.1        
Interest Expense $ 4.9 $ 4.9 $ 14.9 $ 14.9          
Senior notes percentage of par value (percent)             99.914%