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Revenue from Contracts with Clients (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]      
Trust, investment and other servicing fees $ 4,361.1 $ 3,995.0 $ 3,852.1
Security commissions and trading income 140.2 133.2 103.6
Other operating income 243.9 194.0 145.5
Securities Commission and Trading      
Disaggregation of Revenue [Line Items]      
Trust, investment and other servicing fees 112.1 102.4 87.1
Products and Services, Other Operating Income      
Disaggregation of Revenue [Line Items]      
Trust, investment and other servicing fees $ 53.9 $ 42.8 $ 41.8