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Debt and Credit Arrangements - 2024 Notes Narratives (Details)
$ / shares in Units, shares in Thousands
1 Months Ended 3 Months Ended
Nov. 06, 2017
USD ($)
Dec. 31, 2017
USD ($)
$ / shares
Mar. 31, 2020
USD ($)
day
$ / shares
Dec. 31, 2019
USD ($)
Dec. 31, 2018
shares
Oct. 31, 2017
$ / shares
Debt Instrument            
Share price (usd per share) | $ / shares     $ 28.98     $ 43.50
Convertible Debt | Convertible Notes, due 2024            
Debt Instrument            
Debt instrument stated interest rate (percent) 1.00%          
Debt instrument face amount $ 258,800,000   $ 258,800,000 $ 258,800,000    
Share conversion rate 0.0170285          
Debt instrument, conversion price (usd per share) | $ / shares     $ 58.725      
Debt instrument, conversion premium     35.00%      
Debt instrument, threshold for consecutive trading days | day     20      
Debt instrument, threshold for consecutive trading days | day     30      
Applicable conversion price threshold (as percentage)     130.00%      
Maximum days after five trading days     5 days      
Applicable conversion price, less than (as percentage)     97.00%      
Debt instrument effective interest rate     4.80%      
Non cash payment for derivative instrument   $ 59,500,000        
Number of shares underlying warrant | shares         4,410  
Proceeds from issuances of warrants   $ 46,000,000.0        
Percentage above previous sales price           65.00%
Net cost of convertible note hedge and warrant     $ 13,500,000      
Convertible Debt | Convertible Notes, due 2024 | Maximum            
Debt Instrument            
Debt instrument, conversion price (usd per share) | $ / shares   $ 71.775        
Convertible Debt | Convertible Notes, due 2024 | Liability Component            
Debt Instrument            
Debt instrument face amount $ 200,100,000          
Debt issuance costs 5,300,000          
Convertible Debt | Convertible Notes, due 2024 | Equity Component            
Debt Instrument            
Debt instrument face amount 58,700,000          
Debt issuance costs $ 1,500,000