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Financing Arrangements - Narrative (Details)
shares in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
USD ($)
shares
Sep. 30, 2023
USD ($)
shares
Mar. 31, 2023
USD ($)
Sep. 30, 2024
USD ($)
Days
shares
Sep. 30, 2023
USD ($)
shares
May 06, 2024
USD ($)
Nov. 02, 2022
USD ($)
Dec. 20, 2021
shares
Debt Instrument [Line Items]                
Settled with cash payment       $ 0 $ 18,700,000      
Interest paid       1,300,000 1,300,000      
Loss on extinguishment of debt $ 0 $ 0   0 (11,400,000)      
Common Stock, Shares outstanding | shares               50.0
Money market investment carrying value 125,900,000 96,200,000   125,900,000 96,200,000      
Cash Held In Other Investments 124,100,000 118,500,000   124,100,000 118,500,000      
Average Repurchase price $ 17.29 $ 21.82   $ 18.82 $ 18.81      
Stock Repurchase Program, Amount           $ 100,000,000 $ 75,000,000  
Common Shares                
Debt Instrument [Line Items]                
Stock Repurchased, Shares | shares 1.2 0.4   1.8 1.5      
Stock Repurchased, Amount $ 20,100,000 $ 7,700,000   $ 34,100,000 $ 28,500,000      
Stock Repurchase Program, Remaining Amount 106,300,000     106,300,000        
Third Amended Credit Facility | Credit Agreement                
Debt Instrument [Line Items]                
Line of credit facility, tentative future commitment increase 242,200,000     242,200,000        
Convertible Senior Notes due 2025                
Debt Instrument [Line Items]                
Outstanding borrowings 0     0        
Transaction costs, debt gross 1,500,000     $ 1,500,000        
Terms of conversion       The Convertible Senior Notes due 2025 are convertible at the option of holders in certain circumstances and during certain periods into the Company’s common shares, cash, or a combination thereof, at the Company’s election.        
Settled with cash payment     $ 18,700,000          
Debt instrument, threshold trading days | Days       20        
Debt Instrument, threshold consecutive trading days | Days       30        
Debt Instrument, threshold Percentage of stock price conversion       130.00%        
Fair value of convertible notes 19,900,000     $ 19,900,000        
Debt Instrument, Face Amount $ 46,000,000   7,500,000 $ 46,000,000        
Loss on extinguishment of debt     11,400,000          
Unamortized debt issuance costs     $ 200,000