Consolidated Balance Sheet (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Held to Maturity, Fair value	$ 4,176.1	$ 2,321.4
Total Loans and Leases, unearned income	$ 287.7	$ 286.2
Preferred Stock, Par Value
Preferred Stock, Authorized	10,000,000
Preferred Stock, Outstanding	16,000
Common Stock, Par Value	$ 1.6667	$ 1.6667
Common Stock, Authorized	560,000,000	560,000,000
Common Stock, Outstanding	233,390,705	237,322,035
Treasury Stock, shares	11,780,819	7,849,489