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Long-Term Debt - Narrative - Convertible Senior Notes (Details)
12 Months Ended
Dec. 20, 2020
$ / shares
Dec. 19, 2020
$ / shares
Dec. 31, 2021
USD ($)
d
$ / shares
Mar. 10, 2021
$ / shares
Dec. 31, 2020
USD ($)
$ / shares
Dec. 14, 2016
USD ($)
Debt Instrument [Line Items]            
Principal amount     $ 428,100,000   $ 608,500,000  
Conversion price per share (in USD per share) | $ / shares $ 56.00     $ 51.00    
Convertible senior notes     $ 136,500,000   271,600,000  
Cash dividends per share (in USD per share) | $ / shares $ 5.00 $ 5.00        
Share price (in usd per share) | $ / shares     $ 46.76      
2 1/4% Notes            
Debt Instrument [Line Items]            
Principal amount     $ 145,900,000   $ 300,000,000.0  
Debt instrument interest rate stated percentage     2.25%   2.25% 2.25%
Extinguishment of debt     $ 154,100,000      
Common stock conversion rate (in shares per USD)     0.0384615      
Conversion price per share (in USD per share) | $ / shares     $ 26.00   $ 26.00  
Threshold trading days | d     20      
Consecutive trading days | d     30      
Convertible senior notes     $ 136,500,000   $ 271,600,000  
Conversion rate of notes to common stock     150.00%      
Repurchase price, percentage of principal amount     100.00%      
Proceeds from issuance of debt     $ 294,200,000      
Effective interest rate (percentage)     5.80%   5.80%  
Debt issuance costs     $ 5,800,000      
2 1/4% Notes | Convertible senior notes            
Debt Instrument [Line Items]            
Principal amount           $ 300,000,000
Debt instrument interest rate stated percentage     2.25%      
Extinguishment of debt     $ 154,100,000      
Convertible trigger price (USD per share) | $ / shares     $ 33.80      
Threshold trading days | d     20      
Consecutive trading days | d     30      
Stock price threshold (percentage)     130.00%      
2 1/4% Notes | Debt Component of Convertible Debt            
Debt Instrument [Line Items]            
Debt issuance costs     $ 4,700,000      
If-converted value above aggregate principal     116,500,000      
2 1/4% Notes | Equity Component of Convertible Debt            
Debt Instrument [Line Items]            
Debt issuance costs     $ 1,100,000