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OTHER COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE INCOME - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balances |  | $ 8,839.5 |  |
Other comprehensive income (loss) |  | 5.5 | $ (26.5) | $ (3.5)
Ending balances |  | 9,505.1 | 8,839.5 |
Currency translation adjustments |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balances |  | (53.0) | (26.5) | (23.0)
Other comprehensive income (loss) before reclassifications and income taxes |  | 7.4 | (28.5) | (4.5)
Reclassification adjustments recognized in non-operating income |  |  | (3.0) | (2.4)
Other comprehensive income (loss), before taxes |  |  | (31.5) | (6.9)
Net deferred tax benefits (income taxes) |  | (1.9) | 5.0 | 3.4
Other comprehensive income (loss) |  | 5.5 | (26.5) | (3.5)
Ending balances |  | (47.5) | (53.0) | (26.5)
Currency translation adjustments | Equity method investments |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balances |  | (50.5) | (36.7) | (43.6)
Other comprehensive income (loss) before reclassifications and income taxes |  | (1.6) | (14.6) | 7.0
Reclassification adjustments recognized in non-operating income |  |  | 0.0 | 0.0
Other comprehensive income (loss), before taxes |  |  | (14.6) | 7.0
Net deferred tax benefits (income taxes) |  | 0.2 | 0.8 | (0.1)
Other comprehensive income (loss) |  | (1.4) | (13.8) | 6.9
Ending balances |  | (51.9) | (50.5) | (36.7)
Currency translation adjustments | Consolidated sponsored investment products - variable interest entities |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balances |  | (2.5) | 10.2 | 20.6
Other comprehensive income (loss) before reclassifications and income taxes |  | 9.0 | (13.9) | (11.5)
Reclassification adjustments recognized in non-operating income |  |  | (3.0) | (2.4)
Other comprehensive income (loss), before taxes |  |  | (16.9) | (13.9)
Net deferred tax benefits (income taxes) |  | (2.1) | 4.2 | 3.5
Other comprehensive income (loss) |  | 6.9 | (12.7) | (10.4)
Ending balances |  | 4.4 | (2.5) | 10.2
Total net deferred tax benefits |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balances |  | (53.0) | (26.5) | (23.0)
Other comprehensive income (loss) before reclassifications and income taxes |  | 7.4 | (28.5) | (4.5)
Reclassification adjustments recognized in non-operating income |  |  | (3.0) | (2.4)
Other comprehensive income (loss), before taxes |  |  | (31.5) | (6.9)
Net deferred tax benefits (income taxes) |  | (1.9) | 5.0 | 3.4
Other comprehensive income (loss) | [1] | 5.5 | (26.5) | (3.5)
Ending balances |  | $ (47.5) | $ (53.0) | $ (26.5)
[1] | Accumulated other comprehensive income

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