XML 80 R71.htm IDEA: XBRL DOCUMENT v3.22.0.1
Debt - 1.25% Convertible Debentures due 2025 (Details)
1 Months Ended 3 Months Ended 104 Months Ended
Mar. 31, 2017
USD ($)
day
shares
Dec. 31, 2015
USD ($)
day
Dec. 31, 2021
USD ($)
day
shares
Dec. 31, 2021
USD ($)
shares
Sep. 30, 2021
USD ($)
Mar. 31, 2020
USD ($)
Mar. 13, 2017
Oct. 24, 2011
Debt Instrument [Line Items]                
Face value     $ 889,400,000 $ 889,400,000 $ 918,000,000      
Repurchased shares (in shares) | shares     0 73,800,000        
Shares repurchased value       $ 1,238,800,000        
Consecutive trading days | day     30          
Trading days | day     20          
Convertible Debentures 1.25% Due 2025                
Debt Instrument [Line Items]                
Stated percentage 1.25%   1.25% 1.25%     1.25%  
Face value $ 350,000,000              
Debt proceeds $ 343,600,000              
Repurchased shares (in shares) | shares 5,800,000              
Shares repurchased value $ 99,100,000              
Long-term debt 252,100,000              
Debt recorded as additional paid-in capital $ 97,900,000              
Conversion ratio 0.0507957              
Percentage of stock closing price to debt conversion price 130.00%              
Consecutive business days | day   5            
Consecutive trading days | day 5              
Trading days | day 5              
Percentage of principal amount redeemable 100.00%              
Repurchased face amount           $ 87,300,000    
Repurchase amount           112,300,000    
Debt repurchase allocation, debt portion     $ 1,100,000 $ 1,100,000   72,800,000    
Debt repurchase allocation - Equity portion     2,300,000 2,300,000   39,500,000    
Unamortized discount write-off     200,000 $ 200,000   16,700,000    
Unamortized costs           700,000    
Loss on repurchases           $ 2,800,000    
Reclassification from permanent equity to mezzanine equity     34,900,000          
If-converted value exceeding principal amount     $ 473,200,000          
Convertible Debentures 1.25% Due 2025 | Ending on Last Trading Day of Previous Fiscal Quarter                
Debt Instrument [Line Items]                
Number of consecutive trading days 30 days              
Convertible Debentures 1.25% Due 2025 | Minimum                
Debt Instrument [Line Items]                
Number of trading days 20 days              
Convertible Debentures 1.25% Due 2025 | Maximum                
Debt Instrument [Line Items]                
Percentage of stock closing price to debt conversion price 98.00%              
Senior Convertible Debentures due in 2031                
Debt Instrument [Line Items]                
Stated percentage               2.75%
Repayments of debt $ 17,800,000              
Repurchased face amount   $ 38,300,000