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Variable Interest Entities - Unconsolidated VIEs (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	$ 313,663.6	$ 305,046.7
Money Market Funds
Total assets of unconsolidated money market mutual funds	4,500.0	3,800.0
Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Carrying value used if distributions received are in excess of investment	0.0
Corporate debt securities | Available-for-sale | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	308.2	364.9
Maximum exposure to loss	359.7	369.8
Residential mortgage-backed pass-through securities | Available-for-sale | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	3,674.2	3,061.1
Maximum exposure to loss	3,881.3	3,199.7
Residential mortgage-backed pass-through securities | Trading | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	9.0	10.4
Maximum exposure to loss	9.0	10.4
Commercial mortgage-backed securities | Available-for-sale | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	5,188.0	4,775.5
Maximum exposure to loss	5,634.3	5,428.6
Commercial mortgage-backed securities | Trading | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	44.2	53.1
Maximum exposure to loss	44.2	53.1
Collateralized debt obligations | Available-for-sale | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	6,560.4	5,403.7
Maximum exposure to loss	6,518.7	5,465.4
Collateralized debt obligations | Trading | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	135.3	2.0
Maximum exposure to loss	135.3	2.0
Other debt obligations | Available-for-sale | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	8,904.0	7,902.2
Maximum exposure to loss	10,580.8	9,002.9
Other debt obligations | Trading | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	210.0	228.4
Maximum exposure to loss	210.0	228.4
Equity securities | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	85.1	110.4
Maximum exposure to loss	85.1	110.4
Other investments: Other limited partnership and fund interests | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	2,766.4	2,091.7
Maximum exposure to loss	4,804.6	3,785.9
Fully secured debt of international real estate funds with recourse to the investment manager, included in maximum loss exposure	$ 236.1	$ 251.9

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