Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Held to Maturity, Fair value	$ 14,267.0	$ 13,010.9
Total Loans and Leases, unearned income	$ 13.2	$ 35.5
Preferred stock, par value (in dollars per share)
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Common stock, par value (in dollars per share)	$ 1.6667	$ 1.6667
Common stock, shares authorized (in shares)	560,000,000	560,000,000
Common stock, shares outstanding (in shares)	219,012,050	226,126,674
Treasury stock, shares (in shares)	26,159,474	19,044,850
Series C Preferred Stock
Preferred stock, shares outstanding (in shares)	16,000	16,000
Series D Preferred Stock
Preferred stock, shares outstanding (in shares)	5,000	5,000