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Other Benefit Plans (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]      
401I(k) plan contributions by employer $ 0.5 $ 0.4 $ 0.4
Other Postretirement Defined Benefit Plan, Liabilities, Noncurrent 1.7 1.6  
Pension and Other Postretirement Benefit Expense 0.3 0.3 $ 0.3
Officer [Member]      
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]      
Accrued benefit liability $ 1.4 $ 2.8