CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Consolidated revenue	$ 612.4	$ 544.3
Consolidated expenses:
Compensation and related expenses	266.7	242.0
Selling, general and administrative	106.4	88.7
Intangible amortization and impairments	23.2	21.9
Interest expense	21.6	22.5
Depreciation and other amortization	5.5	5.2
Other expenses (net)	12.0	11.4
Total consolidated expenses	435.4	391.7
Equity method income (net)	96.3	85.9
Investment and other income	14.2	14.8
Income before income taxes	287.5	253.3
Income tax expense	63.5	59.7
Net income	224.0	193.6
Net income (non-controlling interests)	(71.0)	(71.1)
Net income (controlling interest)	$ 153.0	$ 122.5
Average shares outstanding (basic) (in shares)	54.6	56.7
Average shares outstanding (diluted) (in shares)	57.0	59.2
Earnings per share (basic) (in dollars per share)	$ 2.80	$ 2.16
Earnings per share (diluted) (in dollars per share)	2.77	2.13
Dividends per share (in dollars per share)	$ 0.30	$ 0.20

The aggregate expense charged against earnings to allocate the cost of tangible assets to periods in which the assets are used and held and to allocate the cost of issuing debt to periods in which the debt is outstanding. As a noncash expense, this element is added back to net income when calculating cash provided by (used in) operations using the indirect method.

No definition available.