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Summary of Significant Accounting Policies (Details 4) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accounting Policies [Abstract]      
Estimated future hurricane repair expenses $ 7.7    
Anticipated insurance recoveries reflected as receivables 0 1.1  
Insurance gains credited to earnings 7.6    
Fair value of Senior Notes 318.4 327.4  
Carrying value of Senior Notes 305.0 305.0  
Cash paid for liquidation of hedge contract     14.2
Impairments of oil and gas properties     15.2
Impairment of long lived assets $ 9.3 $ 8.4