Legal Proceedings (Details)		1 Months Ended
	Mar. 04, 2019 retirement_and_benefit_fund	Jan. 31, 2019 lawsuit multinational_bank municipal_pension_fund
Commitments and Contingencies Disclosure [Abstract]
Number of class action lawsuits | lawsuit		2
Number of retirement and benefit funds | municipal_pension_fund		2
Number of multinational banks | multinational_bank		18
Number of retirement and benefit funds | retirement_and_benefit_fund	4