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Debt (Details Textuals) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Sep. 30, 2012
Dec. 31, 2012
3.67% Senior Notes [Member]
Oct. 10, 2012
3.67% Senior Notes [Member]
Sep. 30, 2012
6.3% Senior Notes [Member]
Debt Instrument [Line Items]        
Line of Credit Facility, Remaining Borrowing Capacity $ 596.2      
Debt Instrument, Face Amount     50 100
Debt Instrument, Interest Rate, Stated Percentage     3.67% 6.30%
Debt Instrument, Maturity Date   Dec. 01, 2022    
Minimum Prepayment Percent     10.00%  
Percent of Price of Repayment     100.00%  
Percent of Principal Balance Paid Due to Change in Control of Company     100.00%  
Debt Instrument, Covenant Description   The Agreement also requires the Company to maintain a consolidated interest coverage ratio of not less than 3.5 to 1.0 and a consolidated leverage ratio of not more than 3.5 to 1.0.    
Payments of Debt Issuance Costs   $ 0.3    
Amortized Issuance Cost Period   10