Annual report pursuant to Section 13 and 15(d)

Other Benefit Plans - Narrative (Details)

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Other Benefit Plans - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]      
401I(k) plan contributions by employer $ 0.5 $ 0.5 $ 0.4
Liability, Other Postretirement Defined Benefit Plan, Noncurrent 0.9 1.1  
Pension and Other Postretirement Benefits Cost (Reversal of Cost) 0.2 0.3 $ 0.3
Officer      
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]      
Accrued benefit liability $ 1.8 $ 1.4