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Business Combinations - Schedule of Unaudited Pro Forma Financial Results (Details) - Baker Street Advisors, LLC and myCIO Wealth Partners, L.P. - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition |  |
Revenue | $ 2,499.4 | $ 2,538.2
Net income (controlling interest) | $ 511.4 | $ 436.3
Earnings per share—basic (in dollars per share) | $ 9.41 | $ 7.93
Earnings per share—diluted (in dollars per share) | $ 9.20 | $ 7.74

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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463 + Details
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