Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Held to maturity, fair value	$ 12,249.3	$ 14,267.0
Total Loans and Leases, unearned income	$ 14.1	$ 13.2
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)	209,709,046	219,012,050
Treasury stock, shares (in shares)	35,462,478	26,159,474
Series C Preferred Stock
Preferred stock, par value (in dollars per share)	$ 0
Preferred stock, shares outstanding (in shares)	16,000	16,000
Series D Preferred Stock
Preferred stock, par value (in dollars per share)	$ 0
Preferred stock, shares outstanding (in shares)	5,000	5,000
Series E Preferred Stock
Preferred stock, shares outstanding (in shares)	16,000