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Summary of Significant Accounting Policies - Financial Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
4.875% senior notes due 2030 | Reported Value Measurement    
Financial Instruments [Line Items]    
Fixed-rate debt $ 400.0 $ 400.0
Level 2 | 4.875% senior notes due 2030 | Estimate of Fair Value Measurement    
Financial Instruments [Line Items]    
Fixed-rate debt 374.5 348.5
Money Market Funds | Level 1 | Fair Value, Recurring    
Financial Instruments [Line Items]    
Cash equivalents, fair value $ 899.4 $ 954.4