Earnings Per Common Share Earnings Per Share Parenthetical (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	6 Months Ended	12 Months Ended
	Oct. 31, 2007	Jun. 30, 2013	Dec. 31, 2013
Warrants on Senior Exchangeable Notes due 2012 [Member]
Class of Warrant or Right [Line Items]
Beginning date for maturity of warrants	Jan. 15, 2013		Jan. 15, 2013
Ending date for maturity of warrants	Mar. 27, 2013		Mar. 27, 2013
Shares issued on conversion of warrants		2,135,221	2,135,221
Warrants on Senior Exchangeable Notes due 2015 [Member]
Class of Warrant or Right [Line Items]
Strike price of warrants			39.10
Senior Exchangeable Notes due 2015 - Settlements 1, 2 and 3 [Member]
Class of Warrant or Right [Line Items]
Redemption amount settled			$ 41.5