Fair Value Measurement - Level III Financial Assets Measured at Fair Value (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Realized and unrealized gains (losses), net
Fair value of assets	$ 7,848.4		$ 7,049.3
Equity securities
Realized and unrealized gains (losses), net
Fair value, asset, recurring basis, unobservable input reconciliation, gain (loss), statement of income or comprehensive income	Net investment income of Consolidated Funds	Net investment income of Consolidated Funds
Fair value, asset, recurring basis, unobservable input reconciliation, asset, gain (loss), statement of other comprehensive income or comprehensive income	Other Comprehensive Income (Loss), Net of Tax	Other Comprehensive Income (Loss), Net of Tax
Fair value, asset, recurring basis, still held, unrealized gain (loss), statement of income or comprehensive income	Net investment income of Consolidated Funds	Net investment income of Consolidated Funds
Bonds
Realized and unrealized gains (losses), net
Fair value, asset, recurring basis, unobservable input reconciliation, gain (loss), statement of income or comprehensive income	Net investment income of Consolidated Funds	Net investment income of Consolidated Funds
Fair value, asset, recurring basis, unobservable input reconciliation, asset, gain (loss), statement of other comprehensive income or comprehensive income	Other Comprehensive Income (Loss), Net of Tax	Other Comprehensive Income (Loss), Net of Tax
Fair value, asset, recurring basis, still held, unrealized gain (loss), statement of income or comprehensive income	Net investment income of Consolidated Funds	Net investment income of Consolidated Funds
Loans
Realized and unrealized gains (losses), net
Fair value, asset, recurring basis, unobservable input reconciliation, gain (loss), statement of income or comprehensive income	Net investment income of Consolidated Funds	Net investment income of Consolidated Funds
Fair value, asset, recurring basis, unobservable input reconciliation, asset, gain (loss), statement of other comprehensive income or comprehensive income	Other Comprehensive Income (Loss), Net of Tax	Other Comprehensive Income (Loss), Net of Tax
Fair value, asset, recurring basis, still held, unrealized gain (loss), statement of income or comprehensive income	Net investment income of Consolidated Funds	Net investment income of Consolidated Funds
Investments in CLOs
Realized and unrealized gains (losses), net
Fair value, asset, recurring basis, unobservable input reconciliation, gain (loss), statement of income or comprehensive income	Net investment income of Consolidated Funds	Net investment income of Consolidated Funds
Fair value, asset, recurring basis, unobservable input reconciliation, asset, gain (loss), statement of other comprehensive income or comprehensive income	Other Comprehensive Income (Loss), Net of Tax	Other Comprehensive Income (Loss), Net of Tax
Fair value, asset, recurring basis, still held, unrealized gain (loss), statement of income or comprehensive income	Net investment income of Consolidated Funds	Net investment income of Consolidated Funds
Other investments
Realized and unrealized gains (losses), net
Fair value, asset, recurring basis, unobservable input reconciliation, gain (loss), statement of income or comprehensive income	Net investment income of Consolidated Funds	Net investment income of Consolidated Funds
Fair value, asset, recurring basis, unobservable input reconciliation, asset, gain (loss), statement of other comprehensive income or comprehensive income	Other Comprehensive Income (Loss), Net of Tax	Other Comprehensive Income (Loss), Net of Tax
Fair value, asset, recurring basis, still held, unrealized gain (loss), statement of income or comprehensive income	Net investment income of Consolidated Funds	Net investment income of Consolidated Funds
Level III
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	$ 6,983.9	$ 6,955.3
Purchases	272.5	1,177.1
Sales and distributions	(225.5)	(940.8)
Settlements	(105.7)	(163.1)
Realized and unrealized gains (losses), net
Included in earnings	143.6	(78.5)
Included in other comprehensive income	62.5	(124.6)
Balance, end of period	7,131.3	6,825.4
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date	131.2	(84.8)
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date	64.8	(102.6)
Fair value of assets	7,131.3		$ 6,983.9
Level III \| Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	430.6	17.9
Purchases	5.4	0.1
Sales and distributions	0.0	(6.8)
Settlements	0.0	0.0
Realized and unrealized gains (losses), net
Included in earnings	(0.5)	0.4
Included in other comprehensive income	0.0	(0.3)
Balance, end of period	435.5	11.3
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date	(0.4)	0.3
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date	0.0	(0.2)
Fair value of assets	17.3
Level III \| Bonds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	594.9	599.5
Purchases	29.8	182.5
Sales and distributions	(47.0)	(186.9)
Settlements	(4.1)	(0.3)
Realized and unrealized gains (losses), net
Included in earnings	11.4	(13.8)
Included in other comprehensive income	8.2	(15.8)
Balance, end of period	593.2	565.2
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date	8.5	(14.5)
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date	8.7	(10.8)
Level III \| Loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	5,352.9	5,898.1
Purchases	237.3	766.0
Sales and distributions	(169.7)	(731.0)
Settlements	(101.6)	(162.8)
Realized and unrealized gains (losses), net
Included in earnings	116.0	(53.9)
Included in other comprehensive income	46.8	(103.9)
Balance, end of period	5,481.7	5,612.5
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date	107.3	(59.4)
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date	48.6	(87.0)
Level III \| Investments in CLOs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	526.1	361.1
Purchases	0.0	227.6
Sales and distributions	(7.9)	(14.1)
Settlements	0.0	0.0
Realized and unrealized gains (losses), net
Included in earnings	19.1	(9.6)
Included in other comprehensive income	7.5	(4.6)
Balance, end of period	544.8	560.4
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date	19.1	(9.6)
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date	7.5	(4.6)
Level III \| Other investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	79.4	78.7
Purchases	0.0	0.9
Sales and distributions	(0.9)	(2.0)
Settlements	0.0	0.0
Realized and unrealized gains (losses), net
Included in earnings	(2.4)	(1.6)
Included in other comprehensive income	0.0	0.0
Balance, end of period	76.1	76.0
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date	(3.3)	(1.6)
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date	$ 0.0	$ 0.0

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of unrealized gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3) and still held.

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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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