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Restructuring Expenses (Details) - Employee severance - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2018
Mar. 31, 2019
Q4 2018 Restructuring Plan      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses   $ 1.3  
Restructuring Reserve     $ 0.1
Q1 2018 Restructuring Plan      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses $ 1.4