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Variable Interest Entities - Unconsolidated VIEs (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	$ 308,777.3	$ 305,046.7
Money Market Funds
Total assets of unconsolidated money market mutual funds	4,200.0	3,800.0
Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Carrying value used if distributions received are in excess of investment	0.0	0.0
Corporate debt securities | Available-for-sale | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	322.6	364.9
Maximum exposure to loss	363.2	369.8
Residential mortgage-backed pass-through securities | Available-for-sale | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	3,329.5	3,061.1
Maximum exposure to loss	3,531.5	3,199.7
Residential mortgage-backed pass-through securities | Trading | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	9.5	10.4
Maximum exposure to loss	9.5	10.4
Commercial mortgage-backed securities | Available-for-sale | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	4,884.1	4,775.5
Maximum exposure to loss	5,402.3	5,428.6
Commercial mortgage-backed securities | Trading | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	21.1	53.1
Maximum exposure to loss	21.1	53.1
Collateralized debt obligations | Available-for-sale | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	5,873.8	5,403.7
Maximum exposure to loss	5,868.7	5,465.4
Collateralized debt obligations | Trading | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	0.5	2.0
Maximum exposure to loss	0.5	2.0
Other debt obligations | Available-for-sale | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	8,327.3	7,902.2
Maximum exposure to loss	9,687.3	9,002.9
Other debt obligations | Trading | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	201.4	228.4
Maximum exposure to loss	201.4	228.4
Equity securities | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	105.0	110.4
Maximum exposure to loss	105.0	110.4
Other investments: Other limited partnership and fund interests | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	2,536.6	2,091.7
Maximum exposure to loss	4,485.0	3,785.9
Fully secured debt of international real estate funds with recourse to the investment manager, included in maximum loss exposure	$ 244.4	$ 251.9

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