Fair Value (Carrying Value Of Assets Measured At Fair Value On A Non-Recurring Basis) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Total
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets held for sale	$ 1,011.4	$ 428.4
Total | Non-Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill		51.8
Assets held for sale	177.8	201.6
Other real estate owned	18.8	22.5
Impaired loans	89.1	151.9
Total	285.7	427.8
Fair Value Measurements at Reporting Date
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets held for sale	1,049.5	439.6
Fair Value Measurements at Reporting Date | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets held for sale	0.0	0.0
Fair Value Measurements at Reporting Date | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets held for sale	4.7	175.0
Fair Value Measurements at Reporting Date | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets held for sale	1,044.8	264.6
Fair Value Measurements at Reporting Date | Non-Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill		0.0
Assets held for sale	0.0	0.0
Other real estate owned	0.0	0.0
Impaired loans	0.0	0.0
Total	0.0	0.0
Fair Value Measurements at Reporting Date | Non-Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill		0.0
Assets held for sale	0.0	0.0
Other real estate owned	0.0	0.0
Impaired loans	0.0	0.0
Total	0.0	0.0
Fair Value Measurements at Reporting Date | Non-Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill		51.8
Assets held for sale	177.8	201.6
Other real estate owned	18.8	22.5
Impaired loans	89.1	151.9
Total	285.7	427.8
Total (Losses) | Non-Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill		(354.2)
Assets held for sale	(15.0)	(14.7)
Other real estate owned	(4.4)	(3.2)
Impaired loans	(21.9)	(26.8)
Total	$ (41.3)	$ (398.9)