Significant Accounting Policies - Narrative (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	9 Months Ended
	Dec. 31, 2013	Jun. 30, 2014
Accounting Policies [Abstract]
French Tax Law Change, Corporate Surtax Rate Increase, Term	2 years
Significant Accounting Policies (Textual) [Abstract]
Ownership interests in certain subsidiaries under equity method investment, maximum		100.00%
Voting rights in investment businesses not traded publicly accounted for under the cost method, Maximum		20.00%
Impact of French Tax Law Change		$ 5.7