Loans (Schedule Of Loans by Product) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Loans and Leases Receivable Disclosure [Line Items]
Total loans	$ 29,113.9	$ 29,535.9	$ 30,518.7
Loans held for sale	1,095.7	635.8
Total	30,209.6	30,171.7
Commercial Banking
Loans and Leases Receivable Disclosure [Line Items]
Total loans	23,577.9	22,970.7
Total	23,807.9	23,538.3
Consumer Portfolio
Loans and Leases Receivable Disclosure [Line Items]
Total loans	5,536.0	6,565.2
Loans | Commercial Banking
Loans and Leases Receivable Disclosure [Line Items]
Total loans	20,892.1	20,117.8
Direct financing leases and leveraged leases | Commercial Banking
Loans and Leases Receivable Disclosure [Line Items]
Total loans	$ 2,685.8	$ 2,852.9