Share Repurchase Program (Details Textuals) (USD $) In Millions, except Per Share data, unless otherwise specified	1 Months Ended	3 Months Ended	6 Months Ended	21 Months Ended
	Jun. 30, 2013	Jun. 30, 2013	Jun. 30, 2013	Jun. 30, 2013
Stockholders' Equity Note [Abstract]
Treasury Stock, Shares, Acquired		1.1	5.0	36.1
Treasury Stock, Value, Acquired, Cost Method		$ 19.0	$ 85.2	$ 547.1
Treasury Stock Acquired, Average Cost Per Share				$ 15.15
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 224.1