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Borrowings - Senior Notes (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Sep. 30, 2019
Sep. 30, 2018
Mar. 31, 2014
Mar. 31, 2013
Debt Instrument [Line Items]                  
Aggregate Principal Amount $ 2,298.4   $ 2,298.4   $ 2,296.7        
Interest Expense $ 17.4 $ 17.2 $ 34.6 $ 34.4          
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        
5.625% 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 378.6   378.6   364.1        
Interest Expense 3.9 3.8 7.7 7.6          
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   600.0         $ 200.0 $ 400.0
Fair Value 540.7   540.7   545.8        
Interest Expense 8.5 8.4 16.9 16.9          
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 318.9   318.9   $ 322.2        
Interest Expense $ 5.0 $ 5.0 $ 10.0 $ 9.9          
Senior notes percentage of par value (percent)             99.914%