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Long-Term Debt (Details 2) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Deferred Financing Costs and Original Issue Discount      
Amortization of deferred financing costs reported as interest expense and other financing costs $ 2.9 $ 5.0 $ 4.9
Estimated amortization of deferred financing costs      
2014 2.8    
2015 2.8    
2016 2.2    
2017 1.9    
2018 0.9    
Thereafter 3.5    
Total 14.1    
Future payments required under capital leases      
Long-term portion 49.9 51.2  
Wynnewood Acquisition | Capital lease
      
Future payments required under capital leases      
2014 6.3    
2015 6.4    
2016 6.4    
2017 6.4    
2018 6.5    
2019 and thereafter 70.3    
Total future payments 102.3    
Less: amount representing interest 51.1    
Present value of future minimum payments 51.2    
Less: current portion 1.3    
Long-term portion 49.9    
Outstanding obligation $ 51.2    
Wynnewood Acquisition | Capital Lease related to Excel Pipeline LLC
      
Estimated amortization of deferred financing costs      
Remaining term of leases 190 months    
Wynnewood Acquisition | Capital Lease related to Magellan Pipeline Terminals, L.P.
      
Estimated amortization of deferred financing costs      
Remaining term of leases 189 months