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Related Party Transactions (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Related Party Transactions      
Revenue recognized from managed funds $ 2,017.2 $ 2,507.9 $ 1,974.6
Accrued income 125.3 204.1  
Accounts receivable 80.7 77.4  
Shares repurchased amount $ 98.9 $ 372.1 $ 130.8