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Variable Interest Entities - Unconsolidated VIEs (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	$ 313,003.3	$ 313,663.6
Money Market Funds
Total assets of unconsolidated money market mutual funds	4,400.0	4,500.0
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	309.2	308.2
Maximum exposure to loss	360.0	359.7
Residential mortgage-backed pass-through securities | Available-for-sale | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	3,763.7	3,674.2
Maximum exposure to loss	3,907.2	3,881.3
Residential mortgage-backed pass-through securities | Trading | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	8.9	9.0
Maximum exposure to loss	8.9	9.0
Commercial mortgage-backed securities | Available-for-sale | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	5,215.7	5,188.0
Maximum exposure to loss	5,600.3	5,634.3
Commercial mortgage-backed securities | Trading | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	68.4	44.2
Maximum exposure to loss	68.4	44.2
Collateralized debt obligations | Available-for-sale | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	6,634.2	6,560.4
Maximum exposure to loss	6,613.2	6,518.7
Collateralized debt obligations | Trading | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	215.2	135.3
Maximum exposure to loss	215.2	135.3
Other debt obligations | Available-for-sale | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	9,084.9	8,904.0
Maximum exposure to loss	10,779.7	10,580.8
Other debt obligations | Trading | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	306.8	210.0
Maximum exposure to loss	306.8	210.0
Equity securities | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	89.6	85.1
Maximum exposure to loss	89.6	85.1
Other investments: Other limited partnership and fund interests | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	2,987.1	2,766.4
Maximum exposure to loss	4,964.5	4,804.6
Fully secured debt of international real estate funds with recourse to the investment manager, included in maximum loss exposure	$ 242.0	$ 236.1

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