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Debt Debt, Textuals (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Debt Instrument [Line Items]      
Debt, Weighted Average Interest Rate 6.27%   6.28%
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 87.00%   87.00%
Line of Credit Facility, Maximum Borrowing Capacity $ 500    
Letters of Credit, Maximum Borrowing Capacity 175    
Letters of Credit Outstanding, Amount 31.7    
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.35%    
Line of Credit Facility, Remaining Borrowing Capacity 381.7    
Repayments of Debt and Capital Lease Obligations 11.4 6.6  
Capital Lease Obligations Incurred $ 14.9 $ 38.3  
February 2013 [Member]
     
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 7.875%