Shareholders' Equity (Detail Textuals) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Stockholders' Equity Note [Abstract]
Stock Repurchase Program Authorized Amount	$ 300,000,000	$ 300,000,000
Stock Repurchase Program Authorized Amount Cancelled	98,000,000
Treasury stock shares acquired	5,600,000	12,600,000
Treasury stock value acquired cost method	178,700,000	373,600,000
Treasury Stock Acquired Average Cost Per Share	$ 32.09	$ 29.55
Treasury Stock Value Acquired Cost Method Current Plan	50,200,000
Treasury Stock Shares Acquired Current Plan	1,400,000
Statutory Accounting Practices Statutory Amount Available For Dividend Payments	293,500,000
Adjustments To Additional Paid In Capital Other	14,400,000
Contingent Earnout Payable	$ 7,000,000