Quarterly report pursuant to Section 13 or 15(d)

Fiduciary Assets and Liabilities - Additional Information (Detail)

v3.21.2
Fiduciary Assets and Liabilities - Additional Information (Detail) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Fiduciary Assets And Liabilities [Abstract]    
Fiduciary liabilities current $ 1,916.6 $ 1,978.2