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Variable Interest Entities - Unconsolidated VIEs (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	$ 304,657.2	$ 296,627.7
Money Market Funds
Total assets of unconsolidated money market mutual funds	4,800.0	4,400.0
Corporate debt securities | Available-for-sale | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	142.1	296.9
Maximum exposure to loss	136.9	285.7
Residential mortgage-backed pass-through securities | Available-for-sale | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	3,152.9	2,986.8
Maximum exposure to loss	3,122.3	2,857.6
Residential mortgage-backed pass-through securities | Trading | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	117.4	190.5
Maximum exposure to loss	117.4	190.5
Commercial mortgage-backed securities | Available-for-sale | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	5,562.2	4,942.3
Maximum exposure to loss	5,436.2	4,741.2
Commercial mortgage-backed securities | Trading | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	25.6	27.1
Maximum exposure to loss	25.6	27.1
Collateralized debt obligations | Available-for-sale | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	3,559.6	4,027.5
Maximum exposure to loss	3,564.7	4,045.9
Collateralized debt obligations | Trading | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	7.5	20.6
Maximum exposure to loss	7.5	20.6
Other debt obligations | Available-for-sale | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	7,560.4	7,045.9
Maximum exposure to loss	7,487.8	6,832.6
Other debt obligations | Trading | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	8.2	9.4
Maximum exposure to loss	8.2	9.4
Equity securities | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	115.4	121.7
Maximum exposure to loss	115.4	121.7
Other investments: Other limited partnership and fund interests | Variable Interest Entity
Unconsolidated Variable Interest Entity disclosures
Asset carrying value	1,209.6	999.1
Maximum exposure to loss	2,053.8	1,739.0
Fully secured debt of international real estate funds with recourse to the investment manager, included in maximum loss exposure	$ 130.5	$ 141.2

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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