Consolidated Balance Sheet (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Held to Maturity, Fair value	$ 1,064.2	$ 817.1
Total Loans and Leases, unearned income	$ 302.2	$ 374.1
Common Stock, Par Value	$ 1.6667	$ 1.6667
Common Stock, Authorized	560,000,000	560,000,000
Common Stock, Outstanding	239,799,129	241,008,509
Treasury Stock, shares	5,372,395	4,163,015