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Long-Term Debt (Details 6) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Debt Disclosure [Abstract]      
Amortization of deferred financing costs reported as interest expense and other financing costs $ 2.8 $ 2.8 $ 2.9
2016 2.2    
2017 1.8    
2018 0.9    
2019 0.9    
2020 0.9    
Thereafter 1.7    
Total $ 8.4