XML 96 R82.htm IDEA: XBRL DOCUMENT v3.8.0.1
Revenue from Contracts with Customers (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Disaggregation of Revenue [Line Items]      
Security commissions and trading income $ 27.2 $ 20.5  
Other operating income 34.8    
Estate settlement revenue transition adjustment     $ 2.7
Securities Commissions and Trading Income      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer 24.0    
Other Operating Income      
Disaggregation of Revenue [Line Items]      
Revenue from contract with customer $ 11.3