Stockholders' Equity and Earnings Per Common Share Authorized Share Repurchase Programs (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Repurchase Program Authorized in July 2012
Authorized Common Stock Repurchase Programs
Stock Repurchase Program, Authorized Amount	$ 750.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount	0
Repurchase Program Authorized in December 2013
Authorized Common Stock Repurchase Programs
Stock Repurchase Program, Authorized Amount	750.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 629.9