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Financing Arrangements - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended
Oct. 29, 2020
May 31, 2016
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Debt Instrument [Line Items]          
Interest paid     $ 4.5 $ 7.6  
Convertible Senior Notes          
Debt Instrument [Line Items]          
Effective interest rate   12.00%      
Initial value of principal   $ 66.9 82.2   $ 78.6
Principal amount allocated to conversion feature   19.4      
Transaction costs, debt   2.4 0.4   $ 0.7
Transaction costs, equity component of convertible debt   $ 0.7      
Maturity date   Jun. 01, 2021      
Fair value of convertible notes     $ 74.9    
Third Amended Credit Facility | Credit Agreement          
Debt Instrument [Line Items]          
Effective interest rate     1.70%    
Amount available for borrowings under amended credit agreement     $ 205.2    
Third Amended Credit Facility | Credit Agreement | Subsequent Event          
Debt Instrument [Line Items]          
Repayments of lines of credit $ 20.0