Consolidated Balance Sheet (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Held to Maturity, Fair value	$ 2,365.5	$ 817.1
Total Loans and Leases, unearned income	$ 309.4	$ 374.1
Common Stock, Par Value	$ 1.6667	$ 1.6667
Common Stock, Authorized	560,000,000	560,000,000
Common Stock, Outstanding	240,516,692	241,008,509
Treasury Stock, shares	4,654,832	4,163,015