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Business Combinations - Narrative (Details) - HD Vest [Member] - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]    
Purchase price   $ 613.7
Working capital adjustment $ 1.8  
Ownership percentage   95.52%
Noncontrolling interest ownership percentage   4.48%
Undiscounted contingent consideration   $ 20.0