CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
Consolidated revenue	$ 607.3	$ 559.1
Consolidated expenses:
Compensation and related expenses	255.0	246.9
Selling, general and administrative	89.4	78.8
Intangible amortization and impairments	12.6	7.5
Interest expense	29.1	27.5
Depreciation and other amortization	3.4	4.3
Other expenses (net)	5.6	13.5
Total consolidated expenses	395.1	378.5
Equity method income (net)	48.6	51.7
Investment and other income	13.6	32.3
Income before income taxes	274.4	264.6
Income tax expense	55.7	50.5
Net income	218.7	214.1
Net income (non-controlling interests)	(72.7)	(64.2)
Net income (controlling interest)	$ 146.0	$ 149.9
Average shares outstanding (basic) (in shares)	39.7	42.6
Average shares outstanding (diluted) (in shares)	46.9	45.4
Earnings per share (basic) (in dollars per share)	$ 3.68	$ 3.52
Earnings per share (diluted) (in dollars per share)	$ 3.44	$ 3.41