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Selected Quarterly Financial Data (Unaudited) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 594.0	$ 551.6	$ 541.0	$ 502.2	$ 491.0	$ 467.3	$ 429.6	$ 417.6	$ 2,188.8	$ 1,805.5	$ 1,704.8
Operating income	153.1	169.1	161.4	150.5	126.9	139.7	25.0	108.8	634.1	400.4	486.1
Income before income taxes	336.6	187.4	172.4	167.3	177.1	137.5	62.9	117.7	863.7	495.2	452.7
Net income (controlling interest)	$ 158.2	$ 75.2	$ 64.7	$ 62.4	$ 75.0	$ 54.9	$ 6.6	$ 37.5	$ 360.5	$ 174.0	$ 164.9
Earnings per share - diluted (in dollars per share)	$ 2.79	$ 1.37	$ 1.18	$ 1.15	$ 1.40	$ 1.04	$ 0.12	$ 0.71	$ 6.55	$ 3.28	$ 3.11

X

- Definition

Amount of fixed fee revenue for the management of an investment fund portfolio. Excludes investment advisory, distribution and servicing, and performance fees.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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