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Acquisitions Schedule of Proforma Information (Tables)
 3 Months Ended
Jun. 30, 2017
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]  
Business Acquisition, Pro Forma Information, Nonrecurring Adjustments [Table Text Block]
 
 
Three Months Ended June 30, 2016
Revenues
 
$
717,516

Net Income Attributable to Legg Mason, Inc.
 
68,281

Net Income Per Share Attributable to Legg Mason, Inc. Shareholders:
 
 
Basic
 
$
0.63

Diluted
 
$
0.63