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Long-Term Debt Long-Term Debt Notes Payable (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Mar. 01, 2013
Dec. 31, 2012
Sep. 17, 2012
Nov. 03, 2011
Dec. 10, 2009
Feb. 27, 2007
Debt Instrument [Line Items]                    
Payments of Debt Issuance Costs   $ 0.0 $ 0.3 $ 16.7            
Repayments of Long-term Debt   157.0 27.0 652.0            
Other expense - Debt refinancing and redemption costs   $ 0.8 $ 0.0 36.8            
Secured Debt [Member] | 9.25% Notes [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Repurchased Face Amount           $ 42.5        
Debt Instrument, Original Discount Amount                 $ 5.5  
Repayments of Long-term Debt       340.0            
Debt instrument, early redemption premium       18.9            
Other expense - Debt refinancing and redemption costs       6.7            
Debt Instrument, Face Amount                 $ 425.0  
Debt Instrument, Redemption Amount       190.0            
Debt Instrument, Interest Rate, Stated Percentage   9.25% 9.25%              
Unsecured Debt [Member] | 6.25% Notes [Member]                    
Debt Instrument [Line Items]                    
Payments of Debt Issuance Costs       6.6            
Long-term debt   $ 400.0 $ 400.0 400.0            
Debt Instrument, Interest Rate, Stated Percentage   6.25%                
Unsecured Debt [Member] | 5.125% Notes [Member]                    
Debt Instrument [Line Items]                    
Payments of Debt Issuance Costs     0.2 3.1            
Long-term debt   $ 200.0 200.0 $ 200.0            
Debt Instrument, Interest Rate, Stated Percentage   5.125%                
Unsecured Debt [Member] | 7.875% Notes [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Repurchased Face Amount         $ 300.0          
Debt instrument, early redemption premium $ 8.5                  
Debt Instrument, Tender Offer, Fees 0.1                  
Other expense - Debt refinancing and redemption costs $ 2.1                  
Debt Instrument, Face Amount                   $ 300.0
Debt Instrument, Interest Rate, Stated Percentage   7.875%                
Unsecured Debt [Member] | 7.75% Notes [Member]                    
Debt Instrument [Line Items]                    
Long-term debt   $ 200.0 200.0              
Debt Instrument, Face Amount               $ 200.0    
Debt Instrument, Interest Rate, Stated Percentage   7.75%                
Unsecured Debt [Member] | 6.625% Notes [Member]                    
Debt Instrument [Line Items]                    
Long-term debt   $ 550.0 $ 550.0              
Debt Instrument, Face Amount             $ 550.0      
Debt Instrument, Interest Rate, Stated Percentage   6.625%                
Unsecured Debt [Member] | 5.25% Notes [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Repurchased Face Amount           $ 250.0        
Debt Instrument, Interest Rate, Stated Percentage   0.00%