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Investments - Investments, Aggregate Fair Value of Ownership and Equity in Losses of Unconsolidated Affiliates (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	$ 629.9		$ 629.9		$ 764.9
Equity in (losses) earnings of unconsolidated affiliates	$ (95.7)	$ (14.6)	$ (97.6)	$ 3.0
Alight
Schedule of Equity Method Investments [Line Items]
Ownership percentage	7.60%		7.60%
Investments in unconsolidated affiliates	$ 229.1		$ 229.1		374.0
Aggregate value of ownership based on quoted market price	229.1		229.1
Equity in (losses) earnings of unconsolidated affiliates	$ (81.7)	2.2	$ (83.6)	(9.1)
BKFC
Schedule of Equity Method Investments [Line Items]
Ownership percentage	42.50%		42.50%
Investments in unconsolidated affiliates	$ 106.0		$ 106.0		108.3
Equity in (losses) earnings of unconsolidated affiliates	$ (12.3)	(17.9)	$ (22.7)	(25.3)
CSI
Schedule of Equity Method Investments [Line Items]
Ownership percentage	6.40%		6.40%
Investments in unconsolidated affiliates	$ 103.9		$ 103.9		88.2
Equity in (losses) earnings of unconsolidated affiliates	$ 0.0	0.2	$ 15.7	41.1
Watkins
Schedule of Equity Method Investments [Line Items]
Ownership percentage	49.30%		49.30%
Investments in unconsolidated affiliates	$ 73.6		$ 73.6		78.5
Equity in (losses) earnings of unconsolidated affiliates	$ (0.1)	0.0	$ (4.8)	0.0
JANA
Schedule of Equity Method Investments [Line Items]
Ownership percentage	19.99%		19.99%
Investments in unconsolidated affiliates	$ 56.9		$ 56.9		56.3
Equity in (losses) earnings of unconsolidated affiliates	0.4	0.5	2.8	0.0
Other
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	60.4		60.4		$ 59.6
Equity in (losses) earnings of unconsolidated affiliates	(2.0)	$ 0.4	(5.0)	$ (3.7)
System1
Schedule of Equity Method Investments [Line Items]
Aggregate value of ownership based on quoted market price	$ 14.9		$ 14.9