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Borrowings - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jan. 04, 2022
Mar. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Jun. 30, 2021
Dec. 18, 2018
Long-term and Short-term Debt Instruments              
Total borrowings at par value     $ 2,625.0   $ 3,025.0    
Repayment of long-term debt     300.0 $ 1,150.0      
Term Loan Facility Borrowing              
Long-term and Short-term Debt Instruments              
Total borrowings at par value [1]         300.0    
Maximum borrowing capacity             $ 950.0
Repayment of long-term debt $ 300.0 $ 650.0          
2.750% Notes Due 2031              
Long-term and Short-term Debt Instruments              
Total borrowings at par value   $ 300.0 $ 300.0 [2]   $ 300.0 [2]    
Stated interest rate (as a percent)   2.75% 2.75%   2.75%    
3.600% Notes Due 2022              
Long-term and Short-term Debt Instruments              
Total borrowings at par value           $ 500.0  
Stated interest rate (as a percent)           3.60%  
[1] See Term Loan Facility section below for further discussion.
[2] The difference between the stated interest rate and the effective interest rate is not significant.