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Borrowings - Senior Notes (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Sep. 30, 2019
Sep. 30, 2018
Mar. 31, 2014
Mar. 31, 2013
Debt Instrument [Line Items]              
Aggregate Principal Amount $ 2,283.1   $ 2,306.7        
Interest Expense $ 17.2 $ 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        
5.625% 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 393.9   401.9        
Interest Expense 3.8 3.8          
Senior notes percentage of par value (percent)       99.841%      
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 588.0   594.6        
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 337.8   $ 336.0        
Interest Expense $ 5.0 $ 5.0          
Senior notes percentage of par value (percent)         99.914%