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Advances - Schedule of Activity in Advances (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Advances [Roll Forward]      
Advances, beginning balance $ 725.1 $ 779.5 $ 834.5
Asset acquisition 42.2 0.0 6.9
New advances 779.8 784.8 831.2
Sales of advances (6.3) (2.9) (1.3)
Collections of advances and other (869.4) (842.8) (888.2)
Advances, ending balance 686.1 725.1 779.5
Advances, net 678.8 718.9 772.4
Transfer to Other assets $ (14.7) $ (6.5) $ 3.7