Stockholders' Equity and Earnings Per Common Share Authorized share repurchase programs (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Repurchase Program Authorized in December 2013 [Member]	Dec. 31, 2013 Repurchase Program Authorized in July 2012 [Member]	Dec. 31, 2012 Repurchase Program Authorized in July 2012 [Member]	Dec. 31, 2013 Repurchase Program Authorized in February 2011 [Member]	Dec. 31, 2011 Repurchase Program Authorized in February 2011 [Member]	Dec. 31, 2013 Repurchase Program Authorized in May 2010 [Member]	Dec. 31, 2010 Repurchase Program Authorized in May 2010 [Member]
Authorized common stock repurchase programs [Line Items]
Stock Repurchase Program, Authorized Amount	$ 750.0		$ 750.0		$ 1,000.0		$ 500.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 730.0	$ 0		$ 0		$ 0