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Debt and Credit Arrangements - 2024 Notes Narratives (Details)
$ / shares in Units, shares in Thousands
1 Months Ended 6 Months Ended
Nov. 06, 2017
USD ($)
Dec. 31, 2017
USD ($)
$ / shares
shares
Jun. 30, 2021
USD ($)
day
$ / shares
Jul. 01, 2021
$ / shares
Dec. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Oct. 31, 2017
$ / shares
Debt Instrument              
Share price (usd per share) | $ / shares     $ 146.32       $ 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 $ 258,800,000  
Share conversion rate(per share) 0.0170285            
Debt instrument, conversion price (usd per share) | $ / shares             $ 58.725
Debt instrument, conversion premium             35.00%
Value of securities above principal amount of debt if converted     $ 386,000,000.0        
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 | Subsequent Event              
Debt Instrument              
Debt instrument, conversion price (usd per share) | $ / shares       $ 76.3425      
Applicable conversion price threshold (as percentage)       130.00%      
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