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Variable Interest Entities - Unconsolidated VIEs (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
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Money Market Funds |  |
Total assets of unconsolidated money market mutual funds | $ 4,500.0 | $ 4,000.0
Corporate debt securities | Available-for-sale |  |
Unconsolidated Variable Interest Entity disclosures |  |
Asset carrying value | 188.2 | 238.2
Maximum exposure to loss | 174.4 | 225.7
Residential mortgage-backed pass-through securities | Available-for-sale |  |
Unconsolidated Variable Interest Entity disclosures |  |
Asset carrying value | 3,323.6 | 2,982.4
Maximum exposure to loss | 3,164.1 | 2,913.9
Residential mortgage-backed pass-through securities | Trading |  |
Unconsolidated Variable Interest Entity disclosures |  |
Asset carrying value | 245.7 | 282.3
Maximum exposure to loss | 245.7 | 282.3
Commercial mortgage-backed securities | Available-for-sale |  |
Unconsolidated Variable Interest Entity disclosures |  |
Asset carrying value | 4,706.5 | 4,850.2
Maximum exposure to loss | 4,785.7 | 4,746.6
Commercial mortgage-backed securities | Trading |  |
Unconsolidated Variable Interest Entity disclosures |  |
Asset carrying value | 26.1 | 28.2
Maximum exposure to loss | 26.1 | 28.2
Collateralized debt obligations | Available-for-sale |  |
Unconsolidated Variable Interest Entity disclosures |  |
Asset carrying value | 3,506.0 | 3,215.3
Maximum exposure to loss | 3,592.9 | 3,226.7
Collateralized debt obligations | Trading |  |
Unconsolidated Variable Interest Entity disclosures |  |
Asset carrying value | 20.3 | 20.9
Maximum exposure to loss | 20.3 | 20.9
Other debt obligations | Available-for-sale |  |
Unconsolidated Variable Interest Entity disclosures |  |
Asset carrying value | 7,549.6 | 8,191.1
Maximum exposure to loss | 7,377.9 | 8,076.4
Other debt obligations | Trading |  |
Unconsolidated Variable Interest Entity disclosures |  |
Asset carrying value | 11.1 | 13.2
Maximum exposure to loss | 11.1 | 13.2
Equity securities |  |
Unconsolidated Variable Interest Entity disclosures |  |
Asset carrying value | 97.6 | 123.2
Maximum exposure to loss | 97.6 | 123.2
Other investments: Other limited partnership and fund interests |  |
Unconsolidated Variable Interest Entity disclosures |  |
Asset carrying value | 931.9 | 911.9
Maximum exposure to loss | 1,481.4 | 1,467.0
Fully secured debt of international real estate funds with recourse to the investment manager, included in maximum loss exposure | $ 128.8 | $ 129.1

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- Definition Total assets held by money market mutual funds that are not consolidated by the entity as the money market funds are registered under Rule 2a-7 of the Investment Company Act of 1940 or are similar unregistered funds. + References No definition available. + Details
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- Definition The amount of debt of managed international rest estate funds that is fully secured by assets whose value exceeds the amount of the debt, but also includes recourse to the investment manager, included in the reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE). + References No definition available. + Details
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- Definition The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118582676&loc=d3e5747-111685 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=118582676&loc=d3e5728-111685 + Details
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- Definition Carrying amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph a -URI http://asc.fasb.org/extlink&oid=118582676&loc=d3e5728-111685 + Details
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