Earnings Per Share - Schedule of Basic and Diluted Earnings (Loss) Per Share (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Numerator
Net income (controlling interest)	$ 123.6	$ 217.0	$ 349.5	$ 476.8
Income from hypothetical settlement of Redeemable non-controlling interests, net of taxes	5.2	17.1	1.0	39.4
Interest expense on junior convertible securities, net of taxes	3.4	3.4	10.1	10.1
Net income (controlling interest), as adjusted	$ 132.2	$ 237.5	$ 360.6	$ 526.3
Denominator
Average shares outstanding (basic) (in shares)	30.1	34.9	31.4	35.6
Effect of dilutive instruments:
Stock options and restricted stock units (in shares)	1.7	1.7	1.9	1.7
Hypothetical issuance of shares to settle Redeemable non-controlling interests (in shares)	1.5	5.1	0.2	3.9
Junior convertible securities (in shares)	1.7	1.7	1.7	1.7
Average shares outstanding (diluted) (in shares)	35.0	43.4	35.2	42.9