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Retirement Plans (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]      
Defined benefit liability $ 0.4 $ 0.3  
Retirement expense $ 0.1 $ 0.1 $ 0.1