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Selected Quarterly Financial Data (Unaudited) - Schedule of Quarterly Results of Operations(Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 589.8	$ 613.1	$ 646.6	$ 635.0	$ 641.2	$ 640.3	$ 636.3	$ 593.1	$ 2,484.5	$ 2,510.9	$ 2,188.8
Operating income	193.2	215.2	195.2	231.4	198.7	224.2	198.4	193.9	835.0	815.2	634.1
Income before income taxes	289.2	249.1	262.0	290.3	312.8	253.4	239.1	208.2	1,090.6	1,013.5	863.7
Net income (controlling interest)	$ 150.3	$ 109.0	$ 128.7	$ 128.0	$ 172.6	$ 103.2	$ 99.1	$ 77.2	$ 516.0	$ 452.1	$ 360.5
Earnings per share - diluted (in dollars per share)	$ 2.72	$ 1.98	$ 2.31	$ 2.27	$ 3.02	$ 1.82	$ 1.75	$ 1.40	$ 9.28	$ 8.01	$ 6.55

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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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