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Borrowings Convertible Debt (Details) - Convertible Debt - Convertible Notes Due Twenty Twenty One
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
$ / shares
Sep. 30, 2019
USD ($)
Mar. 31, 2017
USD ($)
Sep. 30, 2020
USD ($)
$ / shares
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
May 04, 2016
USD ($)
$ / shares
Schedule of Convertible Debt              
Debt Instrument, Interest Rate, Stated Percentage             3.25%
Debt Instrument, Convertible, Conversion Ratio       54.2741      
Debt Instrument, Convertible, Conversion Price | $ / shares $ 18.4250     $ 18.4250      
Debt Issuance Costs, Net $ 5.0     $ 5.0      
Debt Issuance Costs Attributable to the Equity Component       1.3      
Debt Instrument, Face Amount 172.5     172.5   $ 172.5 $ 172.5
Debt Instrument, Unamortized Discount (9.5)     (9.5)   (15.7)  
Convertible Notes Payable 163.0     163.0   156.8  
Convertible Notes Payable, Current 0.0     0.0   0.0  
Convertible Notes Payable, Noncurrent 163.0     163.0   156.8  
Debt Instrument, Convertible, Carrying Amount of Equity Component 29.9     29.9   $ 29.9  
Debt Instrument, Fair Value Disclosure 183.0     183.0      
Interest Expense, Debt, Excluding Amortization 1.4 $ 1.4   4.2 $ 4.2    
Amortization of Debt Issuance Costs 0.2 0.2   0.7 0.6    
Amortization of Debt Discount (Premium) 1.9 1.7   5.5 5.1    
Interest Expense, Debt $ 3.5 $ 3.3   $ 10.4 $ 9.9    
Payments for Hedge, Financing Activities     $ 44.5        
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares             $ 21.1050
Proceeds from issuance of warrants     $ 39.1