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Segment Information - Schedule of Segment Information (Details) - USD ($)
$ 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
Segment Reporting Information                      
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
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
Total assets 7,784.8       7,698.1       7,784.8 7,698.1 6,318.8
Goodwill 2,668.4       2,652.8       2,668.4 2,652.8 2,341.7
Equity method investments in Affiliates 1,937.1       1,783.5       1,937.1 1,783.5 1,123.3
Institutional                      
Segment Reporting Information                      
Revenue                 979.4 1,022.8 948.7
Net income (controlling interest)                 229.3 227.0 219.9
Total assets 3,725.9       3,739.8       3,725.9 3,739.8 3,196.5
Goodwill 1,141.3       1,159.1       1,141.3 1,159.1 1,076.3
Equity method investments in Affiliates 1,609.3       1,533.8       1,609.3 1,533.8 942.6
Mutual Fund                      
Segment Reporting Information                      
Revenue                 1,238.2 1,242.6 1,023.0
Net income (controlling interest)                 229.7 180.1 103.4
Total assets 3,075.5       3,082.0       3,075.5 3,082.0 2,448.4
Goodwill 1,119.5       1,125.3       1,119.5 1,125.3 928.1
Equity method investments in Affiliates 185.7       150.3       185.7 150.3 77.7
High Net Worth                      
Segment Reporting Information                      
Revenue                 266.9 245.5 217.1
Net income (controlling interest)                 57.0 45.0 37.2
Total assets 983.4       876.3       983.4 876.3 673.9
Goodwill 407.6       368.4       407.6 368.4 337.3
Equity method investments in Affiliates $ 142.1       $ 99.4       $ 142.1 $ 99.4 $ 103.0