Investments - Schedule of Consolidated Investments (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Variable Interest Entity
Total Assets	$ 25,868.3	$ 27,619.0
Total Liabilities	12,953.1	13,954.9
RMMC/RMBC
Variable Interest Entity
Total Assets	228.2	204.9
Total Liabilities	21.2	19.1
Other
Variable Interest Entity
Total Assets	43.3	70.8
Total Liabilities	$ 16.1	$ 14.8