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Variable Interest Entities - Consolidated VIEs (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | --- | ---
Carrying amounts of consolidated VIE assets and liabilities |  |  |  |  |  |
Total assets | $ 271,309.4 |  | $ 276,087.8 |  |  |
Total liabilities | 255,725.7 |  | 261,137.1 |  |  |
Redeemable noncontrolling interest | 272.7 | $ 239.7 | 264.9 | $ 304.5 | $ 537.7 | $ 391.2
Aggregate consolidated variable interest entities |  |  |  |  |  |
Carrying amounts of consolidated VIE assets and liabilities |  |  |  |  |  |
Total assets | 37,665.2 |  | 40,802.1 |  |  |
Total liabilities | 36,492.7 |  | 39,713.7 |  |  |
Redeemable noncontrolling interest | 197.5 |  | 215.4 |  |  |
Grantor trust |  |  |  |  |  |
Carrying amounts of consolidated VIE assets and liabilities |  |  |  |  |  |
Total assets |  |  | 99.9 |  |  |
Total liabilities |  |  | 98.6 |  |  |
Mandatory retirement savings funds |  |  |  |  |  |
Carrying amounts of consolidated VIE assets and liabilities |  |  |  |  |  |
Total assets | 36,849.1 |  | 39,891.1 |  |  |
Total liabilities | 36,454.6 |  | 39,524.9 |  |  |
Real estate VIE |  |  |  |  |  |
Carrying amounts of consolidated VIE assets and liabilities |  |  |  |  |  |
Total assets | 452.8 |  | 479.7 |  |  |
Total liabilities | 29.8 |  | 88.0 |  |  |
Sponsored investment funds |  |  |  |  |  |
Carrying amounts of consolidated VIE assets and liabilities |  |  |  |  |  |
Total assets | 363.3 |  | 331.4 |  |  |
Total liabilities | 8.3 |  | 2.2 |  |  |
Redeemable noncontrolling interest | $ 197.5 |  | $ 215.4 |  |  |

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