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Variable Interest Entities - Unconsolidated VIEs (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Unconsolidated Variable Interest Entity disclosures    
Asset carrying value $ 282,580.6 $ 304,657.2
Money Market Funds    
Total assets of unconsolidated money market mutual funds 4,600.0 4,800.0
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 240.1 142.1
Maximum exposure to loss 768.8 136.9
Residential mortgage-backed pass-through securities | Available-for-sale | Variable Interest Entity    
Unconsolidated Variable Interest Entity disclosures    
Asset carrying value 1,737.8 3,152.9
Maximum exposure to loss 1,959.9 3,122.3
Residential mortgage-backed pass-through securities | Trading | Variable Interest Entity    
Unconsolidated Variable Interest Entity disclosures    
Asset carrying value 4.8 117.4
Maximum exposure to loss 4.8 117.4
Commercial mortgage-backed securities | Available-for-sale | Variable Interest Entity    
Unconsolidated Variable Interest Entity disclosures    
Asset carrying value 4,988.3 5,562.2
Maximum exposure to loss 5,642.9 5,436.2
Commercial mortgage-backed securities | Trading | Variable Interest Entity    
Unconsolidated Variable Interest Entity disclosures    
Asset carrying value 84.7 25.6
Maximum exposure to loss 84.7 25.6
Collateralized debt obligations | Available-for-sale | Variable Interest Entity    
Unconsolidated Variable Interest Entity disclosures    
Asset carrying value 3,994.7 3,559.6
Maximum exposure to loss 4,128.9 3,564.7
Collateralized debt obligations | Trading | Variable Interest Entity    
Unconsolidated Variable Interest Entity disclosures    
Asset carrying value 6.2 7.5
Maximum exposure to loss 6.2 7.5
Other debt obligations | Available-for-sale | Variable Interest Entity    
Unconsolidated Variable Interest Entity disclosures    
Asset carrying value 6,040.5 7,560.4
Maximum exposure to loss 6,750.3 7,487.8
Other debt obligations | Trading | Variable Interest Entity    
Unconsolidated Variable Interest Entity disclosures    
Asset carrying value 80.7 8.2
Maximum exposure to loss 80.7 8.2
Equity securities | Variable Interest Entity    
Unconsolidated Variable Interest Entity disclosures    
Asset carrying value 91.9 115.4
Maximum exposure to loss 91.9 115.4
Other investments: Other limited partnership and fund interests | Variable Interest Entity    
Unconsolidated Variable Interest Entity disclosures    
Asset carrying value 1,400.7 1,209.6
Maximum exposure to loss 2,317.7 2,053.8
Fully secured debt of international real estate funds with recourse to the investment manager, included in maximum loss exposure $ 102.2 $ 130.5