v3.26.3
Variable Interest Entities - Unconsolidated VIEs (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Unconsolidated Variable Interest Entity disclosures    
Asset carrying value $ 338,742.2 $ 341,376.5
Money Market Funds    
Total assets of unconsolidated money market mutual funds 5,500.0 5,900.0
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 225.3 289.4
Maximum exposure to loss 311.9 361.7
Residential mortgage-backed pass-through securities | Available-for-sale | Variable Interest Entity    
Unconsolidated Variable Interest Entity disclosures    
Asset carrying value 3,398.8 3,805.1
Maximum exposure to loss 3,663.6 3,868.4
Residential mortgage-backed pass-through securities | Trading | Variable Interest Entity    
Unconsolidated Variable Interest Entity disclosures    
Asset carrying value 7.2 8.4
Maximum exposure to loss 7.2 8.4
Commercial mortgage-backed securities | Available-for-sale | Variable Interest Entity    
Unconsolidated Variable Interest Entity disclosures    
Asset carrying value 5,638.3 5,371.6
Maximum exposure to loss 6,049.1 5,659.6
Commercial mortgage-backed securities | Trading | Variable Interest Entity    
Unconsolidated Variable Interest Entity disclosures    
Asset carrying value 58.6 70.7
Maximum exposure to loss 58.6 70.7
Collateralized debt obligations | Available-for-sale | Variable Interest Entity    
Unconsolidated Variable Interest Entity disclosures    
Asset carrying value 5,798.8 6,422.3
Maximum exposure to loss 5,803.4 6,417.4
Collateralized debt obligations | Trading | Variable Interest Entity    
Unconsolidated Variable Interest Entity disclosures    
Asset carrying value 206.9 211.0
Maximum exposure to loss 206.9 211.0
Other debt obligations | Available-for-sale | Variable Interest Entity    
Unconsolidated Variable Interest Entity disclosures    
Asset carrying value 11,839.8 10,681.3
Maximum exposure to loss 13,842.7 12,167.2
Other debt obligations | Trading | Variable Interest Entity    
Unconsolidated Variable Interest Entity disclosures    
Asset carrying value 244.9 338.8
Maximum exposure to loss 244.9 338.8
Equity securities | Variable Interest Entity    
Unconsolidated Variable Interest Entity disclosures    
Asset carrying value 115.8 109.5
Maximum exposure to loss 115.8 109.5
Other investments: Other limited partnership and fund interests | Variable Interest Entity    
Unconsolidated Variable Interest Entity disclosures    
Asset carrying value 3,323.6 3,498.4
Maximum exposure to loss 5,124.0 5,500.7
Fully secured debt of international real estate funds with recourse to the investment manager, included in maximum loss exposure $ 247.5 $ 256.1