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Restructuring Expenses (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
segment
Q4 2018 Restructuring Plan    
Restructuring Cost and Reserve [Line Items]    
Restructuring expenses $ 1.3  
Q1 2018 Restructuring Plan    
Restructuring Cost and Reserve [Line Items]    
Restructuring expenses $ 3.0  
2017 Restructuring Plan    
Restructuring Cost and Reserve [Line Items]    
Number of positions eliminated | segment   100
Restructuring payments   $ 4.2
2017 Restructuring Plan | Employee severance I Restructuring Cost and Reserve    
Restructuring Cost and Reserve [Line Items]    
Restructuring expenses   3.7
2017 Restructuring Plan | Facility Closing I Restructuring Cost and Reserve    
Restructuring Cost and Reserve [Line Items]    
Restructuring expenses   $ 0.6