Consolidated Balance Sheet (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Held to Maturity, Fair value	$ 5,665.0	$ 4,176.1
Total Loans and Leases, unearned income	$ 277.0	$ 287.7
Preferred Stock, Par Value	$ 0	$ 0
Preferred Stock, Authorized	10,000,000	10,000,000
Preferred Stock, Outstanding	16,000	16,000
Common Stock, Par Value	$ 1.6667	$ 1.6667
Common Stock, Authorized	560,000,000	560,000,000
Common Stock, Outstanding	233,368,512	233,390,705
Treasury Stock, shares	11,803,012	11,780,819